I am using a server jar called Mohist that combines spigot with forge, but with this mod every biome is replaced with plains. I have been told that it is a bukkit biome restriction issue but I can't get any more information. Is there any way to prevent this issue? My best guess is that spigot or bukkit doesn't get the memo that the biome id formats aren't vanilla so it reads a zero or null byte and defaults to plains.
It would be ok if I could simply disable the biome id portion of the mod, but there isn't a config file so that's not an option. At this point I am planning on using Not Enough IDs simply because it doesn't affect biomes.

exactly the same problem, the developer Mohist can fix it, but does not want to, he banally closed my problem.

#42

Same as this issue. was found around 2018 and never been fixed.