VSI Stops Working During Descent

Hi folks, I’ve searched the forum for “VSI” and found nothing so I would like to ask the community if anyone has experienced the above? I’ve experienced this on the 172 and the TBM930 and only started happening after update 5. When I set my VSI to descend the fpm rate does not show on the screen. It works fine up till that point and when I tried it today it worked on my first ATC target descent to 16000ft then stopped displaying when I was instructed to descend further.