What I expected to happen was:
My player skin to be shown in-game.
What actually happened was:
It showed Minecraft's default skin, Steve.
Steps to Trigger the Bug:
1. Select your desired skin (on Mac).
2. Start game and load a random world.
3. If you don't see anything wrong, let me know.
Linked issues
duplicates 1
Comments

Thank you for your report!
We're tracking this issue in MC-101579, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-101579, which was later resolved as invalid. The reason for this is because this issue is most likely caused by malware or other software that is interfering with Minecraft. Please see the Moderator Note attached to the parent ticket to potentially fix this issue.