Completion handler in SLComposeViewController returns 1 regardless of user action

Question

I'm using some fairly standard code to post to Facebook using the Social Framework. Running on my 6+, the code works as expected, and I can either cancel a post, or successfully post to my Facebook wall.

Problem: The completion handler should give a YES/NO result on whether the post is completed. But the handler returns YES (1) regardless of whether the user presses "cancel" or "post." I've tried a few versions of code I've found and I'm always getting a 1 regardless. The first post I've seen discussing this is just 5 days old -- is this a new bug? Is anybody else seeing this?

   SLComposeViewController *mySocialComposer;

if([SLComposeViewController isAvailableForServiceType:SLServiceTypeFacebook]) {
    mySocialComposer = [SLComposeViewController
                        composeViewControllerForServiceType:SLServiceTypeFacebook];
    [mySocialComposer addImage:[UIImage imageNamed:@"TOEICFlash.png"]];

    [mySocialComposer setCompletionHandler:^(SLComposeViewControllerResult result){
        NSLog(@"Completion handler = %li", (long)result);
        if (result == SLComposeViewControllerResultCancelled)
        {
            NSLog(@"The user cancelled.");
        }
        else if (result == SLComposeViewControllerResultDone)
        {
            NSLog(@"The user posted to Facebook");
        }
    }];

    [self presentViewController:mySocialComposer animated:YES completion:nil];

}