March 25, 20232 yr If you're doing this as part of a mod, it should already be added with the rest of the datapack. If you're trying to add them to the overworld, you need to make sure that it is done so via BiomeDictionary#addOverworldBiome (or #addBiome) within FMLCommonSetupEvent in the deferred work queue (#enqueueWork).
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