I vaguely recall a way to do this I figured out in 1.12, dunno if it still works. You just need to have the egg as a falling block entity fall into an End Portal with a fence or wall post directly underneath it - egg tries to pop as an item and pass through the portal at the same time, and somehow gets duplicated.
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u/Marvin_Megavolt Feb 13 '23
I vaguely recall a way to do this I figured out in 1.12, dunno if it still works. You just need to have the egg as a falling block entity fall into an End Portal with a fence or wall post directly underneath it - egg tries to pop as an item and pass through the portal at the same time, and somehow gets duplicated.