1456456465: The subclass of NSIncrementalStore causes infinite recursion after iOS upgrade.

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Description

This issue is only reproducible when the app fetches incremental store metadata via metadataForPersistentStoreOfType: URL: error: method after upgrade to iOS 13 beta 6.

Inside NSIncrementalStore subclass I have code like this:

• (BOOL)loadMetadata:(NSError *__autoreleasing *)error {
  NSURL *storeURL = [self URL];

  NSDictionary *metadata = @{NSStoreUUIDKey: <#key loaded from backing data store#>,
  NSStoreTypeKey: @"XYZMyIncrementalStore"};
  [self setMetadata:metadata];

  return YES;
  }

The bug isn't reproducible with freshly installed apps.

https://www.dropbox.com/s/hj2nl3oenm5ycly/app%20crash.png?dl=0
https://www.dropbox.com/s/ze56t153jlvx1lc/Screen%20Shot%202019-08-22%20at%2010.44.40%20AM.png?dl=0

Product Version: iOS 13 beta 6
Created: 2019-08-22T07:56:13.170124
Originated: 2019-08-15T00:00:00
Open Radar Link: http://www.openradar.me/1456456465