Loïc Dubar

As mentioned by Graylen_MYT25, the bug is still around (after all this time) BUT IT'S WORSE! The bug now seems to affect worlds from after the 1.21.51 update (I have a backup in 1.21.7x). The iceberg biome changed (so all version before the new change might be affected) which means that the trick I used to fix my world is no longer a solution. The only solution now is probably to load the world in a previous Minecraft version (good luck with that), load all the chunks (which is not fun) and update Minecraft.

Minecraft version : 1.21.101

GoldenHelmet: I am saying that when the game generates chunks and checks whether neighboring chunks have been generated in a previous version, it then misinterprets the biome data of the previously saved chunk (or fails and assume a default). Then, there is a wrong blending in the new chunk causing the discontinuities.

And no, it doesn’t seems to be exactly the same underlying mechanism as MCPE-175332 since it seems to be missing the blending (the biomes seems to be unchanged in the screenshots) rather than blending with the wrong biome.

Also, I don’t really agree with the description of this bug and I opened MCPE-217769 which was closed as a duplicate. Sorry for the delayed response, I hadn’t enabled the notifications.

et1et got the idea of the way I fixed the issue for my world. It only works since the biomes in that area of the world didn’t change between the versions.

blab blob: Have you read my previous comment? It has the description of my fix.

P.S. THE BUG ISN’T FIXED YET! (opening the game with my backups still cause the bug). I would still like to see this bug fixed so I can enjoy opening my old backups again. Here is one of them if it can help (1.21.5* according to https://www.chunker.app/ ):

I can confirm (I accidentally made a duplicate) but to clarify, the chunks that regenerate incorrectly are the ones that the game never saved. From my experience, it seems like the game thinks that the old loaded chunks are frozen plains and try to blend them in with the iceberg biome.

FIX (maybe)

One fix for this, if you have a backup from before reloading the area, is to use https://www.chunker.app/ to update the world version, the conversion process make it so the game thinks the old loaded chunks are from the current version so it doesn’t try to incorrectly blend them in (my theory). It also works if the backup was opened in the newer version but the problematic area wasn’t visited (in this case, you just force the update of the chunks with the tool before the game does). Unfortunately, it might also break a necessary blend somewhere else (where there would be a new biome) if you can’t load that area before but I cannot verify that (my biomes haven’t changed in the loaded part of my world).

It worked for me:

After that, you should probably make sure to load ALL the chunks of the area before the next update.