I experienced the same issue in my environment (XCode 16.2, Intel MBP, iOS Simulator). However after getting "Couldn't find the Objective-C runtime library in loaded images" at the first breakpoint, manually attaching the debugger allowed subsequent breakpoints to function properly. Therefore, I'm using the following workaround by running without a debugger and attaching manually: Product > Scheme > Edit Scheme... Choose "Run" from left pane. In the "Info" tab of right pane, uncheck "Debug executable" Run Application Debug > Attach to Process > (Choose Your Simulator from the top of the list) Since I've just started using this method, I can't guarantee it will always work, but it might be helpful for debugging except for the very initial startup phase.