Overlapping annotations and touch propagation

When annotations overlap, the touch events on the top most annotation gets sent to the underlying annotations so it is sometimes impossible to select an annotation to expand and shrink or even use the disclosure button without triggering the annotation(s) underneath.

Have you encountered this?

Code to reproduce

- (NSArray *)annotations {
    // Empire State Building
    JPSThumbnail *empire = [[JPSThumbnail alloc] init];
    empire.image = [UIImage imageNamed:@"empire.jpg"];
    empire.title = @"Empire State Building";
    empire.subtitle = @"NYC Landmark";
    empire.coordinate = CLLocationCoordinate2DMake(40.75f, -73.99f);
    empire.disclosureBlock = ^{ NSLog(@"selected Empire"); };

    // Apple HQ
    JPSThumbnail *apple = [[JPSThumbnail alloc] init];
    apple.image = [UIImage imageNamed:@"apple.jpg"];
    apple.title = @"Apple HQ 1";
    apple.subtitle = @"Apple Headquarters 1";
    apple.coordinate = CLLocationCoordinate2DMake(37.33f, -122.03f);
    apple.disclosureBlock = ^{ NSLog(@"selected Appple"); };

    JPSThumbnail *apple2 = [[JPSThumbnail alloc] init];
    apple2.image = [UIImage imageNamed:@"apple.jpg"];
    apple2.title = @"Apple HQ 2";
    apple2.subtitle = @"Apple Headquarters 2";
    apple2.coordinate = CLLocationCoordinate2DMake(37.34f, -123.03f);
    apple2.disclosureBlock = ^{ NSLog(@"selected Appple 2"); };

    JPSThumbnail *apple3 = [[JPSThumbnail alloc] init];
    apple3.image = [UIImage imageNamed:@"apple.jpg"];
    apple3.title = @"Apple HQ 3";
    apple3.subtitle = @"Apple Headquarters 3";
    apple3.coordinate = CLLocationCoordinate2DMake(37.35f, -113.03f);
    apple3.disclosureBlock = ^{ NSLog(@"selected Appple 3"); };

    // Parliament of Canada
    JPSThumbnail *ottawa = [[JPSThumbnail alloc] init];
    ottawa.image = [UIImage imageNamed:@"ottawa.jpg"];
    ottawa.title = @"Parliament of Canada";
    ottawa.subtitle = @"Oh Canada!";
    ottawa.coordinate = CLLocationCoordinate2DMake(45.43f, -75.70f);
    ottawa.disclosureBlock = ^{ NSLog(@"selected Ottawa"); };

    return @[[JPSThumbnailAnnotation annotationWithThumbnail:empire],
             [JPSThumbnailAnnotation annotationWithThumbnail:apple],
             [JPSThumbnailAnnotation annotationWithThumbnail:apple2],
             [JPSThumbnailAnnotation annotationWithThumbnail:apple3],
             [JPSThumbnailAnnotation annotationWithThumbnail:ottawa]];
}

Start by reproducing the overlap with the annotations method and the JPSThumbnailAnnotation instances shown in the report. Trace how touch events move between overlapping annotations, then verify that selecting or using the disclosure button on the top annotation no longer triggers annotations underneath.