When "Experimental On" was enabled, achievements could no longer be obtained.

Previously (1.21.43), I could get achievements even if I turned on "Experiment" by re-editing after creating a world. (However, I know that if you turn on "Experiment" when creating a new world, you will not be able to get them.) I can no longer get all the achievements from my previous world... I had to delete all my worlds and start over from scratch...