This bug also appeared in the Android version after the update to 1.17. I use the Android version in Linux, but the results are the same.
The body of my custom skin changes each time I return to the main menu and is either randomly pixellated or striped with some colour. The actual skin is never shown.
I have not had any problems with this skin previously and if I change to 1.16 in the Linux Android launcher, the skin is fine.
Thank you for your report!
We're tracking this issue in MCPE-130275, so this ticket is being resolved and linked as a duplicate.
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