for a multiplayer world on Minecraft Bedrock, when players join with a custom skin and the world owner has one too, the custom skin of the players will be the same as the world owner one. Nothings happens to the players who have created their skins in the Minecraft character creator .
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Thank you for your report!
We're already tracking this issue at MCPE-48207, so I will resolve and link this ticket as a duplicate.
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