Leaks detection not working for UIViewController subclass

gistfile1.matlab

@interface SubclassNSObject : NSObject
@property (nonatomic, strong) SubclassNSObject *other;
@end

@implementation SubclassNSObject
@end

@interface SubclassUIViewController : UIViewController
@property (nonatomic, strong) SubclassUIViewController *other;
@end

@implementation SubclassUIViewController
@end

{
    SubclassNSObject *a = [SubclassNSObject new]; ///< Leak detected
    a.other = a;
    
    SubclassUIViewController *b = [SubclassUIViewController new]; ///< Leak **NOT** detected
    b.other = b;
}

I have no idea why the SubclassNSObject shows as a leak but SubclassUIViewController does not :-(. Sniffs of a bug to me.