CoreData iPadOS 15.7 new bug: SEGV_MAPERR in mergeChangesFromContextDidSave:

Since iPadOS 15.7 was released we are receiving crash logs from customers running iOS 15.7.

The crash occurs after calling mergeChangesFromContextDidSave: on a private queue NSManagedObjectContext.

Code as below, the crash occurs on the mergeChanges line.

We have not seen this crash on earlier iOS releases, which suggests that a (threading?) bug was introduced in Core Data in iOS / iPadOS 15.7.

Four crash logs are attached. Unfortunately symbolication failed using symbolicatecrash + Xcode 14.0.1 RC1, but I'm sure Apple's internal symbolication tool will succeed :-)

 @objc func mainContextChanged(notification: Notification) {
        guard let ctx = notification.object,
              ctx as? NSManagedObjectContext != backgroundContext else {
            return
        }

        let ctxt = backgroundContext
        ctxt?.perform { [weak ctxt] in
            ctxt?.mergeChanges(fromContextDidSave: notification)
        }
    }