Hey, I somehow keep having entities and blocks getting deleted from my worlds. I believe this bug started in like 1.14.4, and got fixed but did not actually fix it. A couple months ago in 1.15.2 vanilla mc world a big chunk of a roof i built got deleted. I did not mess with any world edit or save files. Now again 1 month ago a 1.16.2 skyblock world all of my villagers got deleted. In 1.16 villagers struck by lightning do not despawn. I checked my light levels all were 9 and above so no zombies can spawn. I again did not mess with anything. This angered me, I had really good villagers and had to get them all over again in survival. Once I completed getting them back a month after (today) All my villagers (and some iron golems) got deleted in 1.16.3. Also some random blocks got deleted. It happened while I was at y=64 getting cobblestone and the villagers/blocks are at y 0-5 around the same y and x coords. It was not lightning or zombies, and could not have been a creeper because it shouldnt have spawned and how would he detonate. (not sure how to reproduce)

I would love it alot for a possible response, Thank YOU! (here is a pic of what happened on the day that i posted this as you can see alot of missing holes and all 14 villagers gone along with 2 golems)
 
Note: This is a custom map with a datapack that does not affect entities and blocks being removed/deleted.