Happens on :

• v1.20.1
• have fabric modloader (probably unrelated) in its latest version
• dracula theme v2 alpha 1
• GUI scale 3

thanks for pointing this out! I haven't been keeping up with Minecraft much lately but it looks like 1.20.2 heavily restructures GUI assets. They also released a tool for automatic conversion which I'll check out now.

Now fixed as of Beta1 which is out on Modrinth