When switching between accounts in the same Minecraft world (especially in local singleplayer or LAN-hosted sessions), previously spawned slimes may disappear or fail to persist. This happens even if the slimes were present and active before the account switch.
Steps to reproduce:
Launch Minecraft and log in with Account A.
Enter a superflat or slime-spawning world and locate slimes.
Exit the world and log out from Account A.
Log in with Account B and open the same world.
Slimes that were previously present are now gone, even if they should persist naturally.
Expected result:
Slimes that were present before account switch should still exist in the world.
Actual result:
Slimes are no longer present after switching to another account, even though other mobs may still be there.
Additional notes:
This issue was observed in 1.21.7 and next versions with both online and offline mode.
The bug does not appear to affect passive mobs or named mobs.
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