I clicked on the skin option on the launcher login interface to change my skin, but after Java responded and entered the game, the skin did not change to Alex. Then I changed the "Change Skin" interface on the official website. After entering the game, the skin is still Alex.
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We're tracking this issue in MC-101579, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as invalid. Please take a look at the parent ticket (MC-101579) and see if an explanation is provided there in the description of the ticket or in the comments for why this issue is invalid.
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