The skins take very long to load or it didn't even appears. This is followed by a error message that appear up in the screen. When the skins menu open in that state, all of the models of characters are blank or just go back into Steve/Alex, even if the player had already made custom skins.
Thank you for your report!
We're actually already tracking this issue at MCPE-55968, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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