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Summary: The Apple documentation states: https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Blocks/Articles/bxUsing.html#//apple_ref/doc/uid/TP40007502-CH5-SW1 > Typically, you shouldn’t need to copy (or retain) a block. You only need to make a copy when you expect the block to be used after destruction of the scope within which it was declared. Copying moves a block to the heap. All blocks generated in the TurboModule infra, for callbacks and promise resolve/reject handlers, can be used after the destruction of the scope within which they were declared. Therefore, let's copy them in the hopes that they mitigate T75876134. **Note:** We copy blocks before pushing them into the `retainedObjects` array in the legacy Infra as well. Context: D2559997 (https://github.com/facebook/react-native/commit/71da2917e577b7ec659083408cff7f9981d6600f), D5589246 (https://github.com/facebook/react-native/commit/2a6965df9063c795b3d3098c4db76e5f595ba44f) Changelog: [Internal] Reviewed By: fkgozali Differential Revision: D23764329 fbshipit-source-id: e71360977bdff74dc570bd40f0139792860f811f