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Bug
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Resolution: Incomplete
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None
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1.17.11 Hotfix
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None
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ubuntu 20.04 Standard B2s, x2 vCPUs, 4GB
view-distance=12
tick-distance=6
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Unconfirmed
Mobs that are stuck in pools of water are not despawning when leaving the area by more than 128 blocks, via the nether or going offline. Increasing number of mobs are spawning in the same location causing the mob cap to be hit and significantly impacting performance on Linux dedicated server (50% CPU load). X-Box Series X client has also crashed when entering the area where mobs are not despawning.
Identified through looking for entities causing performance / lag. Usage of x-ray texture pack to locate the entities and kill of all entities resolves the issue, but cannot perform on server without cheat enabled.
Not yet able to identify whether it's related to mobs that cannot pathfind out of water which are open to the surface, or related to helmet wearing mobs. All seem to be within 2-3 deep of the surface so are not killed by sun light. Further testing needed
Example of mobs building up in one area

Example of another group of mobs building up in the area
