Skins sometimes default to Steve or Alex even though the player has a specific skin on.
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I can't confirm at the moment, but I have experienced this bug on Xbox in singleplayer and on Windows, most notably while playing on the MCC Official Server.
What servers is this happening on?
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Are you using any add-ons/behavior packs/resource packs in your world? If so, does disabling them solve the issue? If not, are you loading into your world before your skin loads in the title screen?
I am not using any ad-dons, behavior packs, or resource packs in my world and I'm not joining before my skin loads.
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This issue is being temporarily resolved as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki