In the Skin creator, released in 1.13.0, sometimes the skin I created would turn into default Steve or Alex skin. I would always have to recreate my character. I have no idea what causes this but the bug became much more of a conflict this time in 1.14.0 (bees update). Basically the same problem had occured but now I can't even recreate the character. No changes are seen. There is an error message in the game that says something like "character file 5 unable to load". I reset my Xbox One and this problem is still there.
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Thank you for your report!
We're already tracking this issue at MCPE-53398, so I will resolve and link this ticket as a duplicate.
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Update: I played the game again and my skin was still there.