Thanks for your replies. I found this similar issue and tried the solution on the last page (deleting a bunch of stuff, including caches and settings) but didn't have time to test it. I suspect it won't be enough though...

Hi, Any luck with this? I'm having very similar issues. Xcode 16.2 iOS/iPadOS 18.3.1 simulators macOS 15.4 It works (somewhat) fine until I enable breakpoints. Once I enable breakpoints, breakpoints take minutes to trigger, pausing execution won't respond, debugged app is frozen in simulator. When bp does get triggered, variable inspector seems to contain only defaults values (uninitialized data, lots of nil pointers) despite using p <variable> showing otherwise. I tried reinstalling Xcode (deleted most of the local and user Developer folders including simulators, caches, runtimes, except old archives and user data), rebooting serveral times. I might try going back to Xcode 16.0 when I find some time...