Worldgen Datapack Update

Hi I have made a datapack in the past for the version 1.20.2 with only a new Dimansion, nothing else. But now I only gent a validation error (version 1.21), I looked up in the new datafolder of this version and saw that the dimansionfolder doesent exists anymore. Now I wonder where I have to put my files from that ordner which how I know/think are essantial. Please help xD