My skins isn't working and it keeps using classic when i put on slim. I got on other servers to and it just won't work. It also puts in the black lines and messes up my skin. Even when i use a classic skin it still will have the black lines.
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Thank you for your report!
We're actually already tracking this issue in MC-180436, so I've resolved and linked this ticket as a duplicate.
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i have the same issue