In login the skin not loading up.

In login my skin that I did with a 3d editor In 1.16.221 not working im logining to my account and it not load the skin (Its a classic skin that i made not a 4k skin.) and its have a layer for the hair and the Hands and in 1.15, 1.14 it loaded even in 1.16 just in the hotfix 1.16.221 not loading just an alex skin loading in..