Steps to Reproduce:
Make sure the world's simulation distance is higher than your render distance
Enter area with mobs
Leave area until they disappear from sight
Go back into area
Observed Results:
Mobs zip back into their proper place
Expected Results:
Mobs should pop in normally
Also i tried to reproduce it but i found a glitch that might be related. When night came two villagers entered their beds and levitated away until they disappeared. I then started to record and when I left and came back into the area they reapeared back in their original spot.
I sped up the video to fit the file size
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This still happens in 1.16.201 to a lesser extent

Can reproduce in 1.16.230.50 beta. Attached a video that better demonstrates the bug.

Does this duplicate MCPE-101102?

This issue is still present in 1.19.2 but it seems that there has to be a good amount of mobs (Not a crazy amount by any means though)