In 1.12.0 version when you select a custom skin and you restart the game the Steve's or Alex's skin will be selected. In 1.13.0.9 the custom skin will be deleted and you will need to find it from the gallery again.
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[Mod] OcelotOnesie
migrated
Thank you for your report!
We're actually already tracking this issue at MCPE-32089, 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.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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