exploit or hack that is able to spawn MASSIVE amounts of wither skulls?

Because recently on my server i started having a problem with low TPS and it turned out to be 24k wither_skulls
but not the item
the entity (the skulls that the wither emits)
idk if that could have been a player or what
maybe all of the wither skulls from the withers spawned in the world traveled there? idk

Thanks!
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