NBT Editor v1.12.1

Main Features:

1.20 & 1.12.1 support
Now allows NaNf, Infinityd, etc. in nbt editor (which doesn't match /data: MC-200070); config option to disable
Config screen is now organized

Bug Fixes:

Fixed a crash when editing command group shortcuts outside of a world (via modmenu)
Fixed group command shortcuts not ticking
Fixed tooltips in config when using dropdowns

Noteworthy Code Base Changes (for API users):

Version has been completely redone, so you should use Version.newSwitch() since it is no longer an enum
Classes named MultiVersion[...] are now MV[...]
MainUtil has had many methods moved into ItemReference and the new TextUtil
Use NBTEditorAPI.registerConfigItem(Consumer<ConfigCategory>) to add to and create new config sub-categories
I'm now regularly commiting and pushing so you can access the latest in-development versions on Github (download the Artifacts.zip for a compiled version)

NBT Editor