diff --git a/demo/webpack.config.ts b/demo/webpack.config.ts
index 6037b9b79d..d189144a40 100644
--- a/demo/webpack.config.ts
+++ b/demo/webpack.config.ts
@@ -85,7 +85,7 @@ export default (env: { playground?: boolean; bench?: boolean } = {}, { mode }) =
       {
         test: /\.css$/,
         use: [
-          'style-loader',
+          'isomorphic-style-loader',
           'css-loader',
           {
             loader: 'esbuild-loader',
diff --git a/src/components/__tests__/__snapshots__/DiscriminatorDropdown.test.tsx.snap b/src/components/__tests__/__snapshots__/DiscriminatorDropdown.test.tsx.snap
index 623b783e7d..d585656828 100644
--- a/src/components/__tests__/__snapshots__/DiscriminatorDropdown.test.tsx.snap
+++ b/src/components/__tests__/__snapshots__/DiscriminatorDropdown.test.tsx.snap
@@ -46,6 +46,7 @@ exports[`Components SchemaView discriminator should correctly render SchemaView
                 "deprecated": false,
                 "description": "",
                 "example": undefined,
+                "expanded": undefined,
                 "explode": false,
                 "in": undefined,
                 "kind": "field",
@@ -285,6 +286,7 @@ exports[`Components SchemaView discriminator should correctly render SchemaView
                 "deprecated": false,
                 "description": "",
                 "example": undefined,
+                "expanded": undefined,
                 "explode": false,
                 "in": undefined,
                 "kind": "field",
@@ -781,6 +783,7 @@ exports[`Components SchemaView discriminator should correctly render SchemaView
                 "deprecated": false,
                 "description": "",
                 "example": undefined,
+                "expanded": undefined,
                 "explode": false,
                 "in": undefined,
                 "kind": "field",
@@ -1020,6 +1023,7 @@ exports[`Components SchemaView discriminator should correctly render SchemaView
                 "deprecated": false,
                 "description": "",
                 "example": undefined,
+                "expanded": undefined,
                 "explode": false,
                 "in": undefined,
                 "kind": "field",
@@ -1752,6 +1756,7 @@ exports[`Components SchemaView discriminator should correctly render SchemaView
           "deprecated": false,
           "description": "",
           "example": undefined,
+          "expanded": undefined,
           "explode": false,
           "in": undefined,
           "kind": "field",
@@ -1991,6 +1996,7 @@ exports[`Components SchemaView discriminator should correctly render SchemaView
           "deprecated": false,
           "description": "",
           "example": undefined,
+          "expanded": undefined,
           "explode": false,
           "in": undefined,
           "kind": "field",
@@ -2482,6 +2488,7 @@ exports[`Components SchemaView discriminator should correctly render discriminat
           "deprecated": false,
           "description": "",
           "example": undefined,
+          "expanded": undefined,
           "explode": false,
           "in": undefined,
           "kind": "field",
@@ -2537,6 +2544,7 @@ exports[`Components SchemaView discriminator should correctly render discriminat
           "deprecated": false,
           "description": "",
           "example": undefined,
+          "expanded": undefined,
           "explode": false,
           "in": undefined,
           "kind": "field",
diff --git a/src/services/models/Field.ts b/src/services/models/Field.ts
index fe798e794e..84efa5f0f3 100644
--- a/src/services/models/Field.ts
+++ b/src/services/models/Field.ts
@@ -41,7 +41,7 @@ const DEFAULT_SERIALIZATION: Record<
  */
 export class FieldModel {
   @observable
-  expanded: boolean | undefined;
+  expanded: boolean | undefined = undefined;
 
   schema: SchemaModel;
   name: string;