I have a similar issue and haven't found any solution yet. It is obviously a problem with iOS 17 because on iOS 16 it used to work as expected.

Same for me today :-(

I also started to get a similar crash when trying to save the background context after using performAndWait. let backgroundContext = container.newBackgroundContext() backgroundContext.performAndWait { ... } try backgroundContext.save() The execution stops showing:     0x7fff250fb6eb <+3618>: movq   %rbx, %rdi     0x7fff250fb6ee <+3621>: callq  0x7fff2519445a            ; _PFAssertSafeMultiThreadedAccess_impl>  0x7fff250fb6f3 <+3626>: jmp    0x7fff250fa905            ; <+60>     0x7fff250fb6f8 <+3631>: callq  0x7fff253bf730            ; symbol stub for: objc_exception_rethrow     0x7fff250fb6fd <+3636>: ud2     CoreData`+[NSManagedObjectContext Multithreading_Violation_AllThatIsLeftToUsIsHonor]:     0x7fff25194769 <+0>: pushq  %rbp     0x7fff2519476a <+1>: movq   %rsp, %rbp     0x7fff2519476d <+4>: callq  0x7fff253bf78a            ; symbol stub for: objc_opt_self>  0x7fff25194772 <+9>: ud2