When I imported a world from 1.20.51 and open it in 1.20.62, I found that all of NPCs in the world were disappear. I don't know whether all of worlds from lower versions would occur this issue when skipping to 1.20.62. But it happened in the world of 1.20.51.
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It only occured when I import the world to Minecraft on my PC. And it only happened in this version of Minecraft as I observed. The NPC I mean was a custom mob with NPC component, and the world I found the issue cannot be uploaded here because it's too big. Meanwhile, after my carefully recheck, I found that not all of NPCs were disappeared, and I still cannot to find anything in common among those disappeared NPCs.
If possible, please attach the add-on used for the custom mob. Also, how large is the world? You could upload it to google drive and make it a shareable link (just make sure it's not set to private). If you do decide to upload the world, please make sure you don't share any private or sensitive information.
Here it is.
https://drive.google.com/file/d/11Uftq5DhGyQwFGOcXfvvDxcb35rl2n72/view?usp=sharing
This could seem like a backup because I changed the suffix. It is actually a zip. And I don't mind my private information (only my username of xbox) in it would be exposed in public.
I also found another issue in this world and I have reported it long time ago. But I haven't received any responses so far. MCPE-175604
Could you please make it so that users who join the world can enable gamemode/cheats? It's currently set so that visitors are in adventure mode and cannot change their gamemode.
It'd also be appreciated if you could attach the add-on you used for the custom mob to the ticket.
It is easy to stop gamemode changing process, just delet the file named "achievement" in the behavior pack's function folder.
It keep disappearing in the latest verion 1.20.70. And I noticed that, the npcmob I created on PC will disappear when I opened it on Android and vice versa, as if they were incompatible. I don't know whether it would only happen between PC and mobile devices or it would happen on any different devices. But it seriously affected on me because I should make sure that any other who open my world won't occur the issue. Meanwhile, the npcmob didn't disappear before won't disappear, no matter it is on PC or Andriod.
Is this still an issue as of 1.21.21? Please ensure that your add-on/behavior pack is updated to work with the latest version of the game before updating your world.
This issue is being temporarily resolved as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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By NPCs are you referring to the education edition NPCs or are you referring to normal mobs? Has this only occurred in a single world, or are multiple affected? What kind of world were you playing on? Singleplayer, Shared, BDS, Realms?
Please attach a copy of the affected world, ideally with a copy of the 1.20.51 world too, so that we can compare them.