I know, this bug will 99% be resolved, but I just want to report it anyways.
As the title said, you can change the biome in debug world by "/fillbiome". This is kinda inconsistent to "/setblock", "/fill" and "/clone" as they will failed. But since debug mode doesn't care about the biome, I think the bug might be resolved.
Comments 2
Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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Can confirm in 24w07a