Same. Since weeks. In every dimension/situation. Opening the inventory or a chest always resolves it, moving the camera helps sometimes. 

 currently on v1.17.41, iPad Pro 11” 2nd gen, iPadOS 15.0.2

• I was mining my iron pyramid beacon. It was so laggy that I closed the app without saving first. After restarting, the blocks I mined but not picked up where gone

• Singleplayer

• 0 Blocks

• Maybe an hour

• Yes they were and yes the point changed multiple times in close distance to the despawn point

• yes

Trading hall: all villagers lost

I build a 6-portal zombie piglin xp farm, each portal 15x15. The build didn’t make them disappear, but after using it for the first time, for maybe an hour straight, they were gone. I had one crash while afk farming, and constant ~5 fps. But I let the device be and just listend to an audiobook while afk farming.

1. Single player

2. The xp farm is directly besides the trading hall, maybe 10 blocks apart from the closest parts of each 

3. Mayyybe a week

4. Yes I changed it many times, sometimes while traveling, sometimes at the place of both structures. Sometimes I slept in the villagers beds, cause I couldn’t find mine.

5. Oh yeah constantly, the trading hall alone cause ~20 fps, but together with the finished so farm (if the portals are on, but the farm isn’t) maybe 15 fps. And while the farm is running see 1.

^{THANK GOODNESS I make daily backups. Remember guys: always make backupS}

^ADDICTION

I loaded up a 1 day old backup and continued from there. I didn’t build the farm yet, I was just gathering the material, and now I noticed 9 out of 22 villagers gone. I did a lot of switching my bed around, sometimes near the villagers, sometimes 100 of blocks away, sometimes in the end, etc. 

Hi, I have the same issue. I’m in a large warped forest rn and I have encountered 3 Enderman in 10 minutes of walking all across it😞