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[0.86] Fix IllegalStateException in SurfaceMountingManager.removeViewAt (#57860) #1402
Description
Activity
+1 for picking #57860 into 0.86. We ship on Expo SDK 57 (RN 0.86.2 → 0.86.3) and hit the fatal
removeViewAt"not a ViewGroup" crash in production on a low-end Android 12 device (moto e22, 2 GB RAM, armeabi-v7a). No app frames in the stack. In our case the trigger was bursts of remounts (a component type declared inside render, so each state update remounted a subtree with SVG icons) while the JS thread was yielding from a long synchronous task. We removed the remount bursts on our side, but the differ bug remains, and Expo SDK 57 apps can't move to 0.87/0.88 yet, so a 0.86.4 with this pick would turn a fatal crash into a soft error for us.
Target Branch
0.86
Link to commit or PR to be picked
react/react-native@3f553d76b (PR react/react-native#57860)
Description
On the new architecture on Android, the Fabric differ can still emit a
removeViewAtmount instruction whose parent tag resolves to a view that is not aViewGroup(in our case an unflattenedViewchild of a FlatList header).SurfaceMountingManager.removeViewAtthen throwsIllegalStateException("Unable to remove a view from a view that is not a ViewGroup…"), which is fatal: the host tears the surface down and users are left on a blank gray screen until they relaunch the app.We hit this in production and on staging on 0.86.x with
fixDifferentiatorParentTagForUnflattenCaseenabled (see react/react-native#57800), reproducing via a Home-tab re-tap that resets a feed whose header holds a carousel.3f553d76b (merged to
mainon 2026-08-10) turns the throw into aReactNoCrashSoftException+ early return, the same treatmentaddViewAtalready gets. It is a single-file, self-contained change with no public API impact, and it applies cleanly on top of the stable branch. Please consider it for the next patch release; the crash class is a full-surface teardown, so the soft exception is a large improvement even before the differ inconsistency itself is fixed.Repro details and Sentry traces available on request.