IMB11

It's because your skin is in the old 1.8 skin format, yes it'll work on your skin, but for some reason it breaks the skinshuffle preview renderer, and we dont...

Seems to be fixed, unless you updated your skin to the modern skin format; 

Just make a Pull Request

Bobby author does not want to backport their fix to 1.20.1, will be putting a "breaks": "bobby" for 1.20.1 jars unfortunately.

We have plans to implement our own cape and ear system that renders optifine and minecraftcapes ears and capes

I am investigating this issue (Sounds dev here)

I have cleaned up the introduction and final sentences, this is good IMO.

We're definitely considering this.

I believe we should do this when we update to 1.21.4 :+1:

Not really much we can do about this, as we can't disable the translation of yml frontmatter without disabling the ability to translate the page title and description.