Yes so you are in the same boat as the rest of us. I filled a bug to apple as well.

I just tested mine and it's working You mean with Rosetta you can edit .xib files?

Isn't there an actually work around for the time being? We can't just open xcode with or without rosetta just to compile. This is blocking on my end I'm entirely stuck. Quick question for you guys, what version of macOS are you running? I realized this has started happening after I updated to 11.2.3. Might be a coincidence though.