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In #28123 I switched these to be lazy references. However that creates a lazy wrapper even if they're synchronously available. We try to as much as possible preserve the original data structure in these cases. E.g. here in the dev outlining I only use a lazy wrapper if it didn't complete synchronously: https://github.com/facebook/react/pull/28272/files#diff-d4c9c509922b3671d3ecce4e051df66dd5c3d38ff913c7a7fe94abc3ba2ed72eR638 Unfortunately we don't have a data structure that tracks the status of each emitted row. We could store the task in the map but then they couldn't be GC:ed as they complete. We could maybe store the status of each element but seems so heavy. For now I just went back to direct reference which might be an issue since it can suspend something higher up when deduped. DiffTrain build for commit https://github.com/facebook/react/commit/ba5e6a8329c7194a2c573c037a37f24ce45ee58f.