I was playing with my sister in the new world I made. I don't know why but she said my skin looks different. I checked and realized my skin turn into a default avatar.
I tried:
Turn off "Only allow Trusted Skin"
Re-import my avatar
but yet nothing worked
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[media][media]

Did your sister also try turning off "Only Allow Trusted Skins"?

yes she did

We're tracking this issue at MCPE-78206, so I will resolve and link this ticket as a duplicate.