While resource packs in general causing bugs may not be supported in this, this is caused by any change to animation to the player in any way, not any specific pack. I've tested it with 3 packs, all revert to Steve as the player skin, no matter what, meaning all skins appear as Steve, and only an old, slightly broken one that put in elbows and knees to the player didn't have the animations break in any way. When a person activates any resource pack that changes a player's animation, if it doesn't change the model, the animation usually breaks, or reverts to vanilla.
