NSMetadataQuery not working in Catalina

Hi,

I have been NSMetadataQuery to monitor the Documents folder of my app to pick up new files that were added. This stopped working in Catalina. Is this a documented issue or change in functionality? Is there any new security permission or privacy thing that I have to enable in my app to continue monitoring the local Documents folder from my own app?

This is the code I was using the setup folder monitoring (which works fine in Mojave ... but not in Catalina):

self.metadataQuery = [[NSMetadataQuery alloc] init];
[self.metadataQuery setSearchScopes:@[dropLocation.path]];
[self.metadataQuery setPredicate:[NSPredicate predicateWithFormat:@"%K LIKE '*.eml'", NSMetadataItemFSNameKey]];
    
[[NSNotificationCenter defaultCenter] addObserverForName:NSMetadataQueryDidFinishGatheringNotification
                                                      object:self.metadataQuery
                                                       queue:nil
                                                  usingBlock:^(NSNotification *note) {
                                                      // do nothing ... not sure why it's required
                                                      NSLog(@"NSMetadataQueryDidFinishGatheringNotification called");
                                                  }];
    
[[NSNotificationCenter defaultCenter] addObserverForName:NSMetadataQueryDidUpdateNotification
                                                      object:self.metadataQuery
                                                       queue:nil
                                                  usingBlock:^(NSNotification *note) {
                                                      NSLog(@"NSMetadataQueryDidUpdateNotification called");
                                                      [self processResultsForQueryWithStartDate: date];
                                                  }];
    
[self.metadataQuery startQuery];