Moving this as an answer instead of a comment. Hope this helps someone experiencing the same issue Found the solution to my issue, it's because I was calling it on Delegate's appDidFinishLaunching and apparently not all resources have been loaded yet at that point in time. I had to change my persistentStore description to this: description.shouldAddStoreAsynchronously = true description.shouldMigrateStoreAutomatically = true description.shouldInferMappingModelAutomatically = true Noticed that it only happened on iOS 15.x Its not the best at it means the store may create it before I did my first persistent store request. Probably adding in a queue manager will help, but that's a different issue

Anyone found the solution for this? Experiencing the same. My loadPersistentStore completion error block is not being triggered         container.loadPersistentStores { (description, error) in             if let error = error {                 error.sendLog()                 fatalError(error.localizedDescription)             }         } is this more of an assertion failure on coredata? can't replicate it myself, but a few crash report happened in Testflight for some users.