Mobs/entities despawn when world is loaded, even with they're tagged.

Both Mobs and Entities despawn when world is loaded, even though the mobs/entities have been tagged.

I encountered this bug on Dec 23, 2021. When I loaded up my survival world, These mobs/entities despawned:

*Hopper Minecart

*Cows(w/ Name Tags)

*2-3 Oak Boats

*An Enderman

*A Drowned

This bug makes survival worlds unbearable and annoying to play, having to gather all the mobs and materials to fix the losses of these mobs/entities every time I load up my world