diff --git a/pkg/front_end/testcases/strong.status b/pkg/front_end/testcases/strong.status
index 0d2af9be591f..fb51b790dbfd 100644
--- a/pkg/front_end/testcases/strong.status
+++ b/pkg/front_end/testcases/strong.status
@@ -13,6 +13,7 @@ dart2js/late_from_dill/main: SemiFuzzFailure
 dart2js/late_statics: SemiFuzzFailure
 static_field_lowering/opt_in: SemiFuzzFailure
 
+dart2js/mixin_super/main: SemiFuzzFailure # https://github.com/dart-lang/sdk/issues/49339
 dartdevc/static_interop_erasure/main: SemiFuzzCrash # https://github.com/dart-lang/sdk/issues/49301
 
 const_functions/const_functions_list: SemiFuzzCrash
diff --git a/pkg/front_end/testcases/weak.status b/pkg/front_end/testcases/weak.status
index b2fcfcf88507..bfca27fe1a2b 100644
--- a/pkg/front_end/testcases/weak.status
+++ b/pkg/front_end/testcases/weak.status
@@ -10,6 +10,7 @@ nnbd_mixed/mixed_mixin: SemiFuzzFailure
 no_such_method_forwarders/abstract_override_abstract_different_type: SemiFuzzFailure
 no_such_method_forwarders/abstract_override_with_different_signature: SemiFuzzFailure
 
+dart2js/mixin_super/main: SemiFuzzFailure # https://github.com/dart-lang/sdk/issues/49339
 dartdevc/static_interop_erasure/main: SemiFuzzCrash # https://github.com/dart-lang/sdk/issues/49301
 
 dart2js/tear_off_patch/main: semiFuzzFailureOnForceRebuildBodies # needs custom libraries.json (and platform?) not setup here