I’ve had the issue with my watch this morning. £1.29 McDonald’s coffee required pattern on watch and re-presenting to the reader, despite it already being unlocked.
Tesco self checkout later on didn’t require pattern unlock and was accepted with the first presentation to the reader.
Interestingly, on the second London underground journey of the day my phone also made me unlock and present it to the reader again when tapping out. The first journey of the day was a simple tap in and out with my phone. I’ve given up on the watch with the underground as the prompt for pattern unlock is too slow to appear and makes you unpopular at peak hours
All transactions were Google Pay with my Monzo card.