When I try to make a skin by the creator items the changes don't appear on my skin and it stays a steve even in multiple it's just a steve I can customise my skins

Do you have any resource packs enabled? If so, does disabling them fix the issue?

Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.

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