Can't link track data with object that's exiting the video

I watched this video on Mocha Essentials ( 04c Tracking Tips - Unlink Tracking [Mocha Essentials])

After following, I am still having a the tracking data to stay on the object I’m filming while the object goes off screen. This is after clicking “None” under the “Link to track” selection menu. I’ve attached a video below to demonstrate the problem more clearly