edit: meant to reply and not comment

Same specs MacOS 12.0 Monterrey and Xcode 12.5.1 from Appstore and the same thing worked.. by disabling Debug executable.. BUT.. this prevents debugging which is quite essential for a developer right? Although when I use the newest beta, Xcode 13, currently on the 4th iteration.. it works no problem, really weird.. I have deleted my app, deleted everything Xcode related, deleted every simulator, followed the advice in the popular post on stackoverflow Nothing. I think the issue will be resolved once I get off of beta.. I hope.. also the last beta I install.

This worked for me.