Tom_The_Geek
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Can confirm, having the same issue and was checking if it had already been reported. I'm using Windows 10 Pro (x64)
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@violine1101 Just checked by launching the game, button still turns yellow after launch, do you want me to add the game settings to the issue?
From my testing and debugging, it appears that the issue isn't that the JSON data is never used, but that the Codecs used to parse it fail. The Dynamic<JsonElement> that is created from the inputed JSON uses the JsonOps.INSTANCE DynamicOps. This Dynamic is then passed to FlatLevelGeneratorSettings.CODEC to decode, which results in the use of a RegistryLookupCodec on the biome registry. This is a problem as the RegistryLookupCodec has a check that reqiures the DynamicOps that is passed to be a RegistryReadOps when decoding, and otherwise triggers an error that causes the reading of the generator-settings to fail and fallback to the default settings for the flat world, and prints the error message: Not a registry ops.