How to recreate:
Fly with an Elytra.
Press "E" to open the inventory.
Your skin in your inventory should be flipped.
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"Works as intended."

Thank you for your report!
We're tracking this issue in MC-85582, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicate of MC-85582.