Happens for me as well since Xcode 13.3

Do you happen to have an anti-virus on your mac? Falcon (crowdstrike), bit-defender?

Same happens for me since Xcode 13.3 and even on Xcode 13.3.1. The only workaround is to wait like 2 hours for the build to actually finish.

Did anyone check if Xcode 13.4 RC solves this?

Xcode 13.4 seems to solve this issue!