When someone joins a multiplayer world(not severs) the skin of any player can be on another player without the player changing the skin, but if the player changes the skin to their own skin (mainly happens when there 3 or more people playing but can happen with just 2 present) their skin is on the other players.
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I hope this detailed enough to the point it that it isnโt confusing

Keep in mind I donโt know that itโs on any other version that isnโt pocket/bedrock edition

Thank you for your report!
We're actually already tracking this issue at MCPE-48207, so I resolved and linked 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.
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