Deep-linking no longer shown on Twitter Cards


I’ve noticed this morning that Twitter cards for all of the tweets I checked (tested ~5) are now longer showing the ‘Open In App’ (and presumably ‘Install App’) buttons on our twitter cards in the iOS Twitter App.

This was working for several days up until this point. Also I’ve re-validated, and manually checked the link meta-data and everything appears in order.

Is there any known issue here?