Versions
WorldEdit version: WorldEdit 7.2.0 Beta 2 (Forge for MC 1.16.1):
Platform version: Forge 1.16.1 32.0.98

Describe the bug
When changing the biome of a block with //setbiome, several other random blocks within a range of approximately 10 blocks around the selected area also change. Sometimes, especially when changing a small amount of blocks, the selected blocks themselves are not even changed, but a random area in its vicinity. This phenomenon occurs since WorldEdit 7.1.0.

Expected behavior
Only the blocks selected should change the biome.

Screenshots

The areas supposed to change are marked with redstone; the blocks were changed from plains to mountains.

Additional context
This may be a feature, if so, I plead for it to be reverted back to what it was. I use a resource pack with biomespecific textures, the ability to change the biome of single blocks is incredibly useful.

This is due to a Minecraft change. There is nothing WorldEdit can do to change how this behaviour works.

To get this reverted, you'd have to request Mojang to change Minecraft to make biomes work in 1x1 space on the x/z axis like they used to.