The actual issue is that Xcode 13 does stop at breapoints, but using the debugger (po someObject) does not print but gives us an error: warning: Swift error in scratch context: error: /Path/To/OurApp/OurApp-Bridging-Header.h:14:9: error: 'SomeSucessfulyUsedDependency.h' file not found This issue happens on parts of our code, other parts work fine. This is reproducible. The same project works fine with Xcode 12 Starting with Xcode 13, when running our app in DEBUG config on sim or device (both iOS 15, but we have tested sims <iOS15 too), the first line in console is: error: invalid target, create a target using the 'target create' command It looks like Xcode 13 is unable to create a target in LLDB. But maybe the console output is misleading and unrelated. That obviously make debugging a none-nice process ... Any help appreciated.