Just loading the WADS regularly, this happens:
thats because you gotta rename all sprites according to the current lump naming system.
2.1 Mods used to have a more nonconventional naming system, with symbols and shit most of us didnt even knew how to replicate manually, making it hella confusing and unintuitive, as you had to visualize the sprite first if you wanted to know how to name it.
For 2.2 you simply gotta make sure to rename all sprites to the more recognizable and intuitive system, which shortens the basic actions with 4 letters, for example: "WALK", "SPIN", "JUMP", etc.
And for those who have 3 letters, they must have a "_" at the beggining. For example: "_RUN" and etc.
The 4 caracters are obligatory.
The only thing that changed was simply the way you name the lump itself (not the rotation, but the 4 caracter word you write to name it), with a more easier way to recognice it and remember it.