Also experiencing this: macOS 15.4 Xcode 16.3 (16E140, installed as RC2) iOS 16.3.1 Simulator (16.4 is affected by URLSession bugs) Debugging ability is sporadic, plus, I get a popup dialog from Finder(?) that says "The file can’t be found." on every run of the app. I've made sure the Xcode 16.3 is the selected Xcode version (I also have 16.2 installed) and have restarted Xcode twice. I have not restarted macOS since upgrading to 15.4.