We are implementing a new view-through attribution in our SDK. But we have a weird issue with startImpression:completionHandler: static method of SKAdNetwork class. It seems like it just blocks current thread execution without calling completionHandler. It doesn't matter if this method was called on main thread or on background thread. Also when we were missing some required fields in SKAdImpression object, completionHandler was called with corresponding error message and thread execution wasn't blocked. Does anyone else has the same issue? We are using latest XCode 12.5 and iPhone X with iOS 14.5. Both are final, not betas.