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    posted a message on Worlds using Experimental Settings are not supported. (20w21a) Java Edition. Need your help!

    I also had this problem, but I believe it was caused by my having originally created the world using customised settings pre 1.13.

    In any case, I had exactly the same warning message pop up every time I loaded the world in 1.16+ and also had the "legacy_biome_init_layer": true," line in my exported world generation settings .json. I found the location of the offending line using NBTExplorer inside: level.dat/Data/WorldGenSettings/dimensions/minecraft:overworld/generator/biome_source and simply deleted it.

    Now the world loads without first presenting me with the warning message. Maybe this helps someone, idk

    Posted in: Recent Updates and Snapshots
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