Slim skin changes to normal after i restart game.

Please provide more info (as how to reproduce error) & logs. Thanks :)

Does any other data disappear? Which launcher are you using?

Hard to say. Its just resets to default Steve's model from time to time.
Note that i have 164 mods at same time, so might be a really rare bug.
Running on 1.18.2
How do i get log?

TLauncher.
Nothing else, it just resets skin model from time to time. Skin stays same.

It's probably due to tlauncher, since it has some skin patches.
I'm not supporting it due to piracy, so I'm closing this.