I already contacted microsoft and they said to contact the developers. I found a post on reddit with this same issue. Every time I open minecraft it reverts to the default steve or alex and not my skin. So I have to set it every time I want to play. Other users have this same problem and heres the reddit link. They might be a different issue but I just dont want to set the skin all the time.
https://www.reddit.com/r/Minecraft/comments/bgpbcm/skin_limited_usage_help/
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I have this same issue with Bedrock 1.12.0 as well. I have a custom skin and I don't know if I have to do something to update the skin or if it is a different problem. I usually get Alex's skin–perhaps I'm using her arms?
Here's the skin I have been using for a loooong time in the game for both Java and Bedrock:
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