I've got the same problem. For now I'll have to build with Xcode 15.2. Filled a report too that you can reference: FB13812719. Hope this will get fixed!

@appleSince80 Does this workaround works for you? I've already tried it and it doesn't help. Also tried increasing deployment target, didn't helped.

Oh wow thanks, I was trying in "Other C Flags" and "Other Swift Flags". Just tried again using User-Defined Settings and it now works. It needs to be added to any target which imports AppIntents.