Previously there was this issue with the Slim Custom Skin Model about the UV in the Left Leg being the same as the Right Leg's, and that was fixed. But it looks like they forgot to change something else... I'm not a natural english speaker, so these images may help explain better.
Thank you for your report!
We're tracking this issue in MCPE-50258, so this ticket is being resolved and linked as a duplicate.
That ticket may be fixed in the latest beta version, however, in the current release version the bug still exists.
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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