Answer
Outdated render passes create zombie children. React discards stale work to avoid committing them.
Quick Answer
Zombie children are child components that are still mounted after their parent's data no longer considers them valid — they have stale props and keep responding to state updates for data that may have been deleted. Happens when parent re-renders are delayed in concurrent mode. Proper key management and guarding against stale data in effects prevents this.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ