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Fix parentTagForUpdate in unflatten-unflatten branch - #56542
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Summary: Fix incorrect parentTag passed as parentTagForUpdate in the unflatten-unflatten branch of calculateShadowViewMutationsFlattener. In the unflatten case, parentTag references a node being created in the same batch, but UPDATE mutations are flushed at position 2 while Creates are at position 5. This causes the UPDATE to reference a parent that does not exist yet, triggering an assertion failure in StubViewTree::mutate(): `oldStubView->parentTag == mutation.parentTag`. The fix changes `parentTag` to `parentTagForUpdate` in the recursive call at line 684, gated behind a new feature flag `fixDifferentiatorParentTagForUnflattenCase` for safe rollout. Changelog: [Internal] Reviewed By: javache Differential Revision: D101508791
@fkgozali has exported this pull request. If you are a Meta employee, you can view the originating Diff in D101508791. |
This pull request has been merged in 5042e58. |
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Apr 21, 2026
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This pull request was successfully merged by @fkgozali in 5042e58 When will my fix make it into a release? | How to file a pick request? |
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Summary:
Fix incorrect parentTag passed as parentTagForUpdate in the unflatten-unflatten branch of calculateShadowViewMutationsFlattener. In the unflatten case, parentTag references a node being created in the same batch, but UPDATE mutations are flushed at position 2 while Creates are at position 5. This causes the UPDATE to reference a parent that does not exist yet, triggering an assertion failure in StubViewTree::mutate():
oldStubView->parentTag == mutation.parentTag.The fix changes
parentTagtoparentTagForUpdatein the recursive call at line 684, gated behind a new feature flagfixDifferentiatorParentTagForUnflattenCasefor safe rollout.Changelog: [Internal]
Reviewed By: javache
Differential Revision: D101508791