When changing one (any) of my skins to a classic skin, then select "choose new skin" and picking a normal minecraft skin image, it says "This is not a minecraft skin, silly" even though it is, that popup should pop-up when the image provided ISN'T a skin, but it pops up anyway. Another thing to note is that the screen goes dark even after you close the pop-up (seen in the image) until you go back and go to the same menu again. The skins were working on previous versions (like ~1.20.10 or ~1.19) but started glitching out in like 1.20.20