MOBS DOES NOT DESPAWN, LOOK AT THE SCREENSHOT, IT SHOWS ALL THE MOBS IN THE WORLD.
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CtrlAltCuteness
Unhelpful bug report. Please search before posting as people like you are posting numerous reports on this. Mojang cannot fix actual bugs if these duplicates are taking time away from the real ones being seen.
[Mod] Umija5895M
Duplicate of MCPE-21856 just add a vote for that.