Tagged Pointer to the rescue😂.

SomeClass.h

// Come from https://blog.csdn.net/wangyanchang21/article/details/80570863
@interface SomeClass : NSObject
@property (nonatomic, strong) NSString *string;

@end

SomeClass.m

@implementation SomeClass

- (void)someMethod
{    
    dispatch_queue_t queue = dispatch_queue_create("memoryBeingFreedCase_4", DISPATCH_QUEUE_CONCURRENT);
    for (int i = 0; i < 1000000; i++)
    {
        dispatch_async(queue, ^{
            // Will crash at some point due to release in the setter.
            self.string = [NSString stringWithFormat:@"The num is %d", i];
            
            // Tagged Pointer will be fine since its just a pointer on stack
            self.string = [NSString stringWithFormat:@"%d", i];
        });
    }
}

@end