diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
index 93bd9db122..39463c92d3 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
@@ -39,8 +39,8 @@ export const disableTextareaChildren = false;
 export const disableMapsAsChildren = false;
 export const disableModulePatternComponents = false;
 export const warnUnstableRenderSubtreeIntoContainer = false;
-export const deferPassiveEffectCleanupDuringUnmount = false;
-export const runAllPassiveEffectDestroysBeforeCreates = false;
+export const deferPassiveEffectCleanupDuringUnmount = true;
+export const runAllPassiveEffectDestroysBeforeCreates = true;
 export const enableModernEventSystem = false;
 export const warnAboutSpreadingKeyToJSX = false;
 export const enableLegacyFBSupport = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.testing.www.js b/packages/shared/forks/ReactFeatureFlags.testing.www.js
index 1934254cc2..aa4ab37762 100644
--- a/packages/shared/forks/ReactFeatureFlags.testing.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.testing.www.js
@@ -39,8 +39,8 @@ export const disableTextareaChildren = __EXPERIMENTAL__;
 export const disableMapsAsChildren = __EXPERIMENTAL__;
 export const disableModulePatternComponents = false;
 export const warnUnstableRenderSubtreeIntoContainer = false;
-export const deferPassiveEffectCleanupDuringUnmount = false;
-export const runAllPassiveEffectDestroysBeforeCreates = false;
+export const deferPassiveEffectCleanupDuringUnmount = true;
+export const runAllPassiveEffectDestroysBeforeCreates = true;
 export const enableModernEventSystem = false;
 export const warnAboutSpreadingKeyToJSX = false;
 export const enableLegacyFBSupport = !__EXPERIMENTAL__;
diff --git a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
index 007577a1f4..a4b2d9d128 100644
--- a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
@@ -13,8 +13,6 @@
 // Use __VARIANT__ to simulate a GK. The tests will be run twice: once
 // with the __VARIANT__ set to `true`, and once set to `false`.
 
-export const deferPassiveEffectCleanupDuringUnmount = __VARIANT__;
-export const runAllPassiveEffectDestroysBeforeCreates = __VARIANT__;
 export const warnAboutSpreadingKeyToJSX = __VARIANT__;
 
 // These are already tested in both modes using the build type dimension,
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index 979b9334bb..1717915938 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -16,10 +16,8 @@ const dynamicFeatureFlags: DynamicFeatureFlags = require('ReactFeatureFlags');
 
 export const {
   debugRenderPhaseSideEffectsForStrictMode,
-  deferPassiveEffectCleanupDuringUnmount,
   disableInputAttributeSyncing,
   enableTrustedTypesIntegration,
-  runAllPassiveEffectDestroysBeforeCreates,
   warnAboutShorthandPropertyCollision,
   disableSchedulerTimeoutBasedOnReactExpirationTime,
   warnAboutSpreadingKeyToJSX,
@@ -83,6 +81,9 @@ export const throwEarlyForMysteriousError = false;
 // to the correct value.
 export const enableNewReconciler = __VARIANT__;
 
+export const deferPassiveEffectCleanupDuringUnmount = true;
+export const runAllPassiveEffectDestroysBeforeCreates = true;
+
 // Flow magic to verify the exports of this file match the original version.
 // eslint-disable-next-line no-unused-vars
 type Check<_X, Y: _X, X: Y = _X> = null;