Currently using both Terralith (2.45) and Nullscape (1.2.3) on a Fabric 1.20.1 singleplayer world (using modrinth). Not currently using any other worldgen mods - just minor ones.
I've removed nullscape and the necessary files in DIM1, hoping that my end would reset to it's vanilla state, but wasn't able to use the stardust website to edit my level.dat folder - I just received error messages (as seen in the attached screenshot).
I intend to keep terralith but remove nullscape, and I'm not really sure where to go from here in terms of editing level.dat and removing additional files.