Note: This report is specific to entity data not being removed at the time each entity dies / despawns / etc. The issue with old entity data not being removed is tracked in MCPE-160818.

1.19.30.20.1 Preview Is the True Fixed version. It does not clean up the mess of the older versions.

It appears that the new entity storage keys don't get cleaned up. The "actorprefix"  and the NBT data that is stored under them are left behind and don't ever get removed after entities are killed or despawned. Thousands are left dangling outside any chunk pointer key ( digp ) wasting space. They may have forgotten a  clean-up function for the expired entities? 

there are now 21731 dangling Entities, do I need to remove these manually?