Out of nowhere, certain skins are vanishing from the skin UI. Like the slot is there, but it just shows a default icon with the blue "loading" symbol. What could be causing this? These are official skins also by the way, paid ones.

Read plugin description (FAQ) and check F1 and provide me output aswell

I checked F1 and its giving me some errors saying,

Invalid skin manifest
Skinnable is null: (random skin number)

That's it. Then skin is invalid and you should use any other one

Weird. I know they used to be there, they must of got rid of the skins completely out of the game

Merged post

For anyone else with this error popping up and skins not loading in the UI, I found the solution

Uninstall Rust and then install it again 

The error is an issue with contents of the workshop folder. After you reinstall Rust, you will get no error messages and all skins will be visible again and not be stuck on the loading icon.