diff --git a/packages/react-reconciler/src/ReactFiberClassComponent.new.js b/packages/react-reconciler/src/ReactFiberClassComponent.new.js
index 9ed6dc23c9f16..389b4877852db 100644
--- a/packages/react-reconciler/src/ReactFiberClassComponent.new.js
+++ b/packages/react-reconciler/src/ReactFiberClassComponent.new.js
@@ -40,6 +40,7 @@ import {
 
 import {
   enqueueUpdate,
+  entangleTransitions,
   processUpdateQueue,
   checkHasForceUpdateAfterProcessing,
   resetHasForceUpdateBeforeProcessing,
@@ -214,7 +215,10 @@ const classComponentUpdater = {
     }
 
     enqueueUpdate(fiber, update, lane);
-    scheduleUpdateOnFiber(fiber, lane, eventTime);
+    const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
+    if (root !== null) {
+      entangleTransitions(root, fiber, lane);
+    }
 
     if (__DEV__) {
       if (enableDebugTracing) {
@@ -246,7 +250,10 @@ const classComponentUpdater = {
     }
 
     enqueueUpdate(fiber, update, lane);
-    scheduleUpdateOnFiber(fiber, lane, eventTime);
+    const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
+    if (root !== null) {
+      entangleTransitions(root, fiber, lane);
+    }
 
     if (__DEV__) {
       if (enableDebugTracing) {
@@ -277,7 +284,10 @@ const classComponentUpdater = {
     }
 
     enqueueUpdate(fiber, update, lane);
-    scheduleUpdateOnFiber(fiber, lane, eventTime);
+    const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
+    if (root !== null) {
+      entangleTransitions(root, fiber, lane);
+    }
 
     if (__DEV__) {
       if (enableDebugTracing) {
diff --git a/packages/react-reconciler/src/ReactFiberClassComponent.old.js b/packages/react-reconciler/src/ReactFiberClassComponent.old.js
index 2b4496ca5c910..36bf2d22f75f6 100644
--- a/packages/react-reconciler/src/ReactFiberClassComponent.old.js
+++ b/packages/react-reconciler/src/ReactFiberClassComponent.old.js
@@ -40,6 +40,7 @@ import {
 
 import {
   enqueueUpdate,
+  entangleTransitions,
   processUpdateQueue,
   checkHasForceUpdateAfterProcessing,
   resetHasForceUpdateBeforeProcessing,
@@ -214,7 +215,10 @@ const classComponentUpdater = {
     }
 
     enqueueUpdate(fiber, update);
-    scheduleUpdateOnFiber(fiber, lane, eventTime);
+    const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
+    if (root !== null) {
+      entangleTransitions(root, fiber, lane);
+    }
 
     if (__DEV__) {
       if (enableDebugTracing) {
@@ -246,7 +250,10 @@ const classComponentUpdater = {
     }
 
     enqueueUpdate(fiber, update);
-    scheduleUpdateOnFiber(fiber, lane, eventTime);
+    const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
+    if (root !== null) {
+      entangleTransitions(root, fiber, lane);
+    }
 
     if (__DEV__) {
       if (enableDebugTracing) {
@@ -277,7 +284,10 @@ const classComponentUpdater = {
     }
 
     enqueueUpdate(fiber, update);
-    scheduleUpdateOnFiber(fiber, lane, eventTime);
+    const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
+    if (root !== null) {
+      entangleTransitions(root, fiber, lane);
+    }
 
     if (__DEV__) {
       if (enableDebugTracing) {
diff --git a/packages/react-reconciler/src/ReactFiberHooks.new.js b/packages/react-reconciler/src/ReactFiberHooks.new.js
index 374d383030cdb..b615ae1e5e221 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.new.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.new.js
@@ -45,6 +45,8 @@ import {
   isSubsetOfLanes,
   mergeLanes,
   removeLanes,
+  intersectLanes,
+  isTransitionLane,
   markRootEntangled,
   markRootMutableRead,
   getCurrentUpdateLanePriority,
@@ -104,7 +106,11 @@ import {getIsRendering} from './ReactCurrentFiber';
 import {logStateUpdateScheduled} from './DebugTracing';
 import {markStateUpdateScheduled} from './SchedulingProfiler';
 import {CacheContext} from './ReactFiberCacheComponent.new';
-import {createUpdate, enqueueUpdate} from './ReactUpdateQueue.new';
+import {
+  createUpdate,
+  enqueueUpdate,
+  entangleTransitions,
+} from './ReactUpdateQueue.new';
 import {pushInterleavedQueue} from './ReactFiberInterleavedUpdates.new';
 
 const {ReactCurrentDispatcher, ReactCurrentBatchConfig} = ReactSharedInternals;
@@ -121,6 +127,7 @@ type Update<S, A> = {|
 export type UpdateQueue<S, A> = {|
   pending: Update<S, A> | null,
   interleaved: Update<S, A> | null,
+  lanes: Lanes,
   dispatch: (A => mixed) | null,
   lastRenderedReducer: ((S, A) => S) | null,
   lastRenderedState: S | null,
@@ -654,6 +661,7 @@ function mountReducer<S, I, A>(
   const queue = (hook.queue = {
     pending: null,
     interleaved: null,
+    lanes: NoLanes,
     dispatch: null,
     lastRenderedReducer: reducer,
     lastRenderedState: (initialState: any),
@@ -811,6 +819,10 @@ function updateReducer<S, I, A>(
       markSkippedUpdateLanes(interleavedLane);
       interleaved = ((interleaved: any).next: Update<S, A>);
     } while (interleaved !== lastInterleaved);
+  } else if (baseQueue === null) {
+    // `queue.lanes` is used for entangling transitions. We can set it back to
+    // zero once the queue is empty.
+    queue.lanes = NoLanes;
   }
 
   const dispatch: Dispatch<A> = (queue.dispatch: any);
@@ -1102,6 +1114,7 @@ function useMutableSource<Source, Snapshot>(
     const newQueue = {
       pending: null,
       interleaved: null,
+      lanes: NoLanes,
       dispatch: null,
       lastRenderedReducer: basicStateReducer,
       lastRenderedState: snapshot,
@@ -1158,6 +1171,7 @@ function mountState<S>(
   const queue = (hook.queue = {
     pending: null,
     interleaved: null,
+    lanes: NoLanes,
     dispatch: null,
     lastRenderedReducer: basicStateReducer,
     lastRenderedState: (initialState: any),
@@ -1821,6 +1835,9 @@ function refreshCache<T>(fiber: Fiber, seedKey: ?() => T, seedValue: T) {
         const lane = requestUpdateLane(provider);
         const eventTime = requestEventTime();
         const root = scheduleUpdateOnFiber(provider, lane, eventTime);
+        if (root !== null) {
+          entangleTransitions(root, fiber, lane);
+        }
 
         const seededCache = new Map();
         if (seedKey !== null && seedKey !== undefined && root !== null) {
@@ -1960,7 +1977,25 @@ function dispatchAction<S, A>(
         warnIfNotCurrentlyActingUpdatesInDev(fiber);
       }
     }
-    scheduleUpdateOnFiber(fiber, lane, eventTime);
+    const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
+
+    if (isTransitionLane(lane) && root !== null) {
+      let queueLanes = queue.lanes;
+
+      // If any entangled lanes are no longer pending on the root, then they
+      // must have finished. We can remove them from the shared queue, which
+      // represents a superset of the actually pending lanes. In some cases we
+      // may entangle more than we need to, but that's OK. In fact it's worse if
+      // we *don't* entangle when we should.
+      queueLanes = intersectLanes(queueLanes, root.pendingLanes);
+
+      // Entangle the new transition lane with the other transition lanes.
+      const newQueueLanes = mergeLanes(queueLanes, lane);
+      if (newQueueLanes !== queueLanes) {
+        queue.lanes = newQueueLanes;
+        markRootEntangled(root, newQueueLanes);
+      }
+    }
   }
 
   if (__DEV__) {
diff --git a/packages/react-reconciler/src/ReactFiberHooks.old.js b/packages/react-reconciler/src/ReactFiberHooks.old.js
index 26721dcd11264..dfde5f7aa116d 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.old.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.old.js
@@ -45,6 +45,8 @@ import {
   isSubsetOfLanes,
   mergeLanes,
   removeLanes,
+  intersectLanes,
+  isTransitionLane,
   markRootEntangled,
   markRootMutableRead,
   getCurrentUpdateLanePriority,
@@ -103,7 +105,11 @@ import {getIsRendering} from './ReactCurrentFiber';
 import {logStateUpdateScheduled} from './DebugTracing';
 import {markStateUpdateScheduled} from './SchedulingProfiler';
 import {CacheContext} from './ReactFiberCacheComponent.old';
-import {createUpdate, enqueueUpdate} from './ReactUpdateQueue.old';
+import {
+  createUpdate,
+  enqueueUpdate,
+  entangleTransitions,
+} from './ReactUpdateQueue.old';
 
 const {ReactCurrentDispatcher, ReactCurrentBatchConfig} = ReactSharedInternals;
 
@@ -118,6 +124,7 @@ type Update<S, A> = {|
 
 type UpdateQueue<S, A> = {|
   pending: Update<S, A> | null,
+  lanes: Lanes,
   dispatch: (A => mixed) | null,
   lastRenderedReducer: ((S, A) => S) | null,
   lastRenderedState: S | null,
@@ -650,6 +657,7 @@ function mountReducer<S, I, A>(
   hook.memoizedState = hook.baseState = initialState;
   const queue = (hook.queue = {
     pending: null,
+    lanes: NoLanes,
     dispatch: null,
     lastRenderedReducer: reducer,
     lastRenderedState: (initialState: any),
@@ -792,6 +800,12 @@ function updateReducer<S, I, A>(
     queue.lastRenderedState = newState;
   }
 
+  if (baseQueue === null) {
+    // `queue.lanes` is used for entangling transitions. We can set it back to
+    // zero once the queue is empty.
+    queue.lanes = NoLanes;
+  }
+
   const dispatch: Dispatch<A> = (queue.dispatch: any);
   return [hook.memoizedState, dispatch];
 }
@@ -1080,6 +1094,7 @@ function useMutableSource<Source, Snapshot>(
     // including any interleaving updates that occur.
     const newQueue = {
       pending: null,
+      lanes: NoLanes,
       dispatch: null,
       lastRenderedReducer: basicStateReducer,
       lastRenderedState: snapshot,
@@ -1135,6 +1150,7 @@ function mountState<S>(
   hook.memoizedState = hook.baseState = initialState;
   const queue = (hook.queue = {
     pending: null,
+    lanes: NoLanes,
     dispatch: null,
     lastRenderedReducer: basicStateReducer,
     lastRenderedState: (initialState: any),
@@ -1798,6 +1814,9 @@ function refreshCache<T>(fiber: Fiber, seedKey: ?() => T, seedValue: T) {
         const lane = requestUpdateLane(provider);
         const eventTime = requestEventTime();
         const root = scheduleUpdateOnFiber(provider, lane, eventTime);
+        if (root !== null) {
+          entangleTransitions(root, fiber, lane);
+        }
 
         const seededCache = new Map();
         if (seedKey !== null && seedKey !== undefined && root !== null) {
@@ -1914,7 +1933,25 @@ function dispatchAction<S, A>(
         warnIfNotCurrentlyActingUpdatesInDev(fiber);
       }
     }
-    scheduleUpdateOnFiber(fiber, lane, eventTime);
+    const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
+
+    if (isTransitionLane(lane) && root !== null) {
+      let queueLanes = queue.lanes;
+
+      // If any entangled lanes are no longer pending on the root, then they
+      // must have finished. We can remove them from the shared queue, which
+      // represents a superset of the actually pending lanes. In some cases we
+      // may entangle more than we need to, but that's OK. In fact it's worse if
+      // we *don't* entangle when we should.
+      queueLanes = intersectLanes(queueLanes, root.pendingLanes);
+
+      // Entangle the new transition lane with the other transition lanes.
+      const newQueueLanes = mergeLanes(queueLanes, lane);
+      if (newQueueLanes !== queueLanes) {
+        queue.lanes = newQueueLanes;
+        markRootEntangled(root, newQueueLanes);
+      }
+    }
   }
 
   if (__DEV__) {
diff --git a/packages/react-reconciler/src/ReactFiberLane.new.js b/packages/react-reconciler/src/ReactFiberLane.new.js
index 4570c10a62b42..88c4d1946cb6d 100644
--- a/packages/react-reconciler/src/ReactFiberLane.new.js
+++ b/packages/react-reconciler/src/ReactFiberLane.new.js
@@ -310,9 +310,8 @@ export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
   }
 
   if (enableTransitionEntanglement) {
-    // We don't need to include higher priority lanes, because in this
-    // experiment we always unsuspend all transitions whenever we receive
-    // an update.
+    // We don't need to do anything extra here, because we apply per-lane
+    // transition entanglement in the entanglement loop below.
   } else {
     // If there are higher priority lanes, we'll include them even if they
     // are suspended.
@@ -492,6 +491,10 @@ export function includesOnlyTransitions(lanes: Lanes) {
   return (lanes & TransitionLanes) === lanes;
 }
 
+export function isTransitionLane(lane: Lane) {
+  return (lane & TransitionLanes) !== 0;
+}
+
 // To ensure consistency across multiple updates in the same event, this should
 // be a pure function, so that it always returns the same lane for given inputs.
 export function findUpdateLane(
@@ -634,6 +637,10 @@ export function removeLanes(set: Lanes, subset: Lanes | Lane): Lanes {
   return set & ~subset;
 }
 
+export function intersectLanes(a: Lanes | Lane, b: Lanes | Lane): Lanes {
+  return a & b;
+}
+
 // Seems redundant, but it changes the type from a single lane (used for
 // updates) to a group of lanes (used for flushing work).
 export function laneToLanes(lane: Lane): Lanes {
diff --git a/packages/react-reconciler/src/ReactFiberLane.old.js b/packages/react-reconciler/src/ReactFiberLane.old.js
index 7be355d2c2458..a083ae68d8a8e 100644
--- a/packages/react-reconciler/src/ReactFiberLane.old.js
+++ b/packages/react-reconciler/src/ReactFiberLane.old.js
@@ -310,9 +310,8 @@ export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
   }
 
   if (enableTransitionEntanglement) {
-    // We don't need to include higher priority lanes, because in this
-    // experiment we always unsuspend all transitions whenever we receive
-    // an update.
+    // We don't need to do anything extra here, because we apply per-lane
+    // transition entanglement in the entanglement loop below.
   } else {
     // If there are higher priority lanes, we'll include them even if they
     // are suspended.
@@ -492,6 +491,10 @@ export function includesOnlyTransitions(lanes: Lanes) {
   return (lanes & TransitionLanes) === lanes;
 }
 
+export function isTransitionLane(lane: Lane) {
+  return (lane & TransitionLanes) !== 0;
+}
+
 // To ensure consistency across multiple updates in the same event, this should
 // be a pure function, so that it always returns the same lane for given inputs.
 export function findUpdateLane(
@@ -634,6 +637,10 @@ export function removeLanes(set: Lanes, subset: Lanes | Lane): Lanes {
   return set & ~subset;
 }
 
+export function intersectLanes(a: Lanes | Lane, b: Lanes | Lane): Lanes {
+  return a & b;
+}
+
 // Seems redundant, but it changes the type from a single lane (used for
 // updates) to a group of lanes (used for flushing work).
 export function laneToLanes(lane: Lane): Lanes {
diff --git a/packages/react-reconciler/src/ReactFiberReconciler.new.js b/packages/react-reconciler/src/ReactFiberReconciler.new.js
index 08ec3c8eac87e..70923424e8870 100644
--- a/packages/react-reconciler/src/ReactFiberReconciler.new.js
+++ b/packages/react-reconciler/src/ReactFiberReconciler.new.js
@@ -65,7 +65,11 @@ import {
   IsThisRendererActing,
   act,
 } from './ReactFiberWorkLoop.new';
-import {createUpdate, enqueueUpdate} from './ReactUpdateQueue.new';
+import {
+  createUpdate,
+  enqueueUpdate,
+  entangleTransitions,
+} from './ReactUpdateQueue.new';
 import {
   isRendering as ReactCurrentFiberIsRendering,
   current as ReactCurrentFiberCurrent,
@@ -315,7 +319,10 @@ export function updateContainer(
   }
 
   enqueueUpdate(current, update, lane);
-  scheduleUpdateOnFiber(current, lane, eventTime);
+  const root = scheduleUpdateOnFiber(current, lane, eventTime);
+  if (root !== null) {
+    entangleTransitions(root, current, lane);
+  }
 
   return lane;
 }
diff --git a/packages/react-reconciler/src/ReactFiberReconciler.old.js b/packages/react-reconciler/src/ReactFiberReconciler.old.js
index 0fc72c42a07e0..1fc12435d64cf 100644
--- a/packages/react-reconciler/src/ReactFiberReconciler.old.js
+++ b/packages/react-reconciler/src/ReactFiberReconciler.old.js
@@ -65,7 +65,11 @@ import {
   IsThisRendererActing,
   act,
 } from './ReactFiberWorkLoop.old';
-import {createUpdate, enqueueUpdate} from './ReactUpdateQueue.old';
+import {
+  createUpdate,
+  enqueueUpdate,
+  entangleTransitions,
+} from './ReactUpdateQueue.old';
 import {
   isRendering as ReactCurrentFiberIsRendering,
   current as ReactCurrentFiberCurrent,
@@ -315,7 +319,10 @@ export function updateContainer(
   }
 
   enqueueUpdate(current, update);
-  scheduleUpdateOnFiber(current, lane, eventTime);
+  const root = scheduleUpdateOnFiber(current, lane, eventTime);
+  if (root !== null) {
+    entangleTransitions(root, current, lane);
+  }
 
   return lane;
 }
diff --git a/packages/react-reconciler/src/ReactUpdateQueue.new.js b/packages/react-reconciler/src/ReactUpdateQueue.new.js
index 84575950c3465..205d7d21d501d 100644
--- a/packages/react-reconciler/src/ReactUpdateQueue.new.js
+++ b/packages/react-reconciler/src/ReactUpdateQueue.new.js
@@ -84,7 +84,7 @@
 // regardless of priority. Intermediate state may vary according to system
 // resources, but the final state is always the same.
 
-import type {Fiber} from './ReactInternalTypes';
+import type {Fiber, FiberRoot} from './ReactInternalTypes';
 import type {Lanes, Lane} from './ReactFiberLane.new';
 
 import {
@@ -92,6 +92,9 @@ import {
   NoLanes,
   isSubsetOfLanes,
   mergeLanes,
+  isTransitionLane,
+  intersectLanes,
+  markRootEntangled,
 } from './ReactFiberLane.new';
 import {
   enterDisallowedContextReadInDEV,
@@ -128,6 +131,7 @@ export type Update<State> = {|
 export type SharedQueue<State> = {|
   pending: Update<State> | null,
   interleaved: Update<State> | null,
+  lanes: Lanes,
 |};
 
 export type UpdateQueue<State> = {|
@@ -167,6 +171,7 @@ export function initializeUpdateQueue<State>(fiber: Fiber): void {
     shared: {
       pending: null,
       interleaved: null,
+      lanes: NoLanes,
     },
     effects: null,
   };
@@ -260,6 +265,33 @@ export function enqueueUpdate<State>(
   }
 }
 
+export function entangleTransitions(root: FiberRoot, fiber: Fiber, lane: Lane) {
+  const updateQueue = fiber.updateQueue;
+  if (updateQueue === null) {
+    // Only occurs if the fiber has been unmounted.
+    return;
+  }
+
+  const sharedQueue: SharedQueue<mixed> = (updateQueue: any).shared;
+  if (isTransitionLane(lane)) {
+    let queueLanes = sharedQueue.lanes;
+
+    // If any entangled lanes are no longer pending on the root, then they must
+    // have finished. We can remove them from the shared queue, which represents
+    // a superset of the actually pending lanes. In some cases we may entangle
+    // more than we need to, but that's OK. In fact it's worse if we *don't*
+    // entangle when we should.
+    queueLanes = intersectLanes(queueLanes, root.pendingLanes);
+
+    // Entangle the new transition lane with the other transition lanes.
+    const newQueueLanes = mergeLanes(queueLanes, lane);
+    if (newQueueLanes !== queueLanes) {
+      sharedQueue.lanes = newQueueLanes;
+      markRootEntangled(root, newQueueLanes);
+    }
+  }
+}
+
 export function enqueueCapturedUpdate<State>(
   workInProgress: Fiber,
   capturedUpdate: Update<State>,
@@ -595,6 +627,10 @@ export function processUpdateQueue<State>(
         newLanes = mergeLanes(newLanes, interleaved.lane);
         interleaved = ((interleaved: any).next: Update<State>);
       } while (interleaved !== lastInterleaved);
+    } else if (firstBaseUpdate === null) {
+      // `queue.lanes` is used for entangling transitions. We can set it back to
+      // zero once the queue is empty.
+      queue.shared.lanes = NoLanes;
     }
 
     // Set the remaining expiration time to be whatever is remaining in the queue.
diff --git a/packages/react-reconciler/src/ReactUpdateQueue.old.js b/packages/react-reconciler/src/ReactUpdateQueue.old.js
index f1c14537a42d3..1d71e14819d87 100644
--- a/packages/react-reconciler/src/ReactUpdateQueue.old.js
+++ b/packages/react-reconciler/src/ReactUpdateQueue.old.js
@@ -84,7 +84,7 @@
 // regardless of priority. Intermediate state may vary according to system
 // resources, but the final state is always the same.
 
-import type {Fiber} from './ReactInternalTypes';
+import type {Fiber, FiberRoot} from './ReactInternalTypes';
 import type {Lanes, Lane} from './ReactFiberLane.old';
 
 import {
@@ -92,6 +92,9 @@ import {
   NoLanes,
   isSubsetOfLanes,
   mergeLanes,
+  isTransitionLane,
+  intersectLanes,
+  markRootEntangled,
 } from './ReactFiberLane.old';
 import {
   enterDisallowedContextReadInDEV,
@@ -123,6 +126,7 @@ export type Update<State> = {|
 
 type SharedQueue<State> = {|
   pending: Update<State> | null,
+  lanes: Lanes,
 |};
 
 export type UpdateQueue<State> = {|
@@ -161,6 +165,7 @@ export function initializeUpdateQueue<State>(fiber: Fiber): void {
     lastBaseUpdate: null,
     shared: {
       pending: null,
+      lanes: NoLanes,
     },
     effects: null,
   };
@@ -234,6 +239,33 @@ export function enqueueUpdate<State>(fiber: Fiber, update: Update<State>) {
   }
 }
 
+export function entangleTransitions(root: FiberRoot, fiber: Fiber, lane: Lane) {
+  const updateQueue = fiber.updateQueue;
+  if (updateQueue === null) {
+    // Only occurs if the fiber has been unmounted.
+    return;
+  }
+
+  const sharedQueue: SharedQueue<mixed> = (updateQueue: any).shared;
+  if (isTransitionLane(lane)) {
+    let queueLanes = sharedQueue.lanes;
+
+    // If any entangled lanes are no longer pending on the root, then they must
+    // have finished. We can remove them from the shared queue, which represents
+    // a superset of the actually pending lanes. In some cases we may entangle
+    // more than we need to, but that's OK. In fact it's worse if we *don't*
+    // entangle when we should.
+    queueLanes = intersectLanes(queueLanes, root.pendingLanes);
+
+    // Entangle the new transition lane with the other transition lanes.
+    const newQueueLanes = mergeLanes(queueLanes, lane);
+    if (newQueueLanes !== queueLanes) {
+      sharedQueue.lanes = newQueueLanes;
+      markRootEntangled(root, newQueueLanes);
+    }
+  }
+}
+
 export function enqueueCapturedUpdate<State>(
   workInProgress: Fiber,
   capturedUpdate: Update<State>,
@@ -559,6 +591,12 @@ export function processUpdateQueue<State>(
     queue.firstBaseUpdate = newFirstBaseUpdate;
     queue.lastBaseUpdate = newLastBaseUpdate;
 
+    if (firstBaseUpdate === null) {
+      // `queue.lanes` is used for entangling transitions. We can set it back to
+      // zero once the queue is empty.
+      queue.shared.lanes = NoLanes;
+    }
+
     // Set the remaining expiration time to be whatever is remaining in the queue.
     // This should be fine because the only two other things that contribute to
     // expiration time are props and context. We're already in the middle of the