Dorna and the FIM announced at the end of the summer break that from Silverstone onward, they woulds start to enforce the minimum tire pressures mandated by Michelin. That enforcement would be delayed at the first round after the summer, the British Grand Prix, as both the sprint race on Saturday and the Sunday grand prix were classed as wet races. The sprint race started on a wet track, the grand prix started as a dry race, but the rain flag was shown, making it formally wet.
The agreement with Michelin was that minimum tire pressures would not be enforced in case of rain, as the conditions changed the stress on the tires and the load put into them considerably. So tire pressures were not checked at Silverstone.
Last weekend's Austrian Grand Prix was a different kettle of fish. Spielberg was caught in the heatwave which has gripped southern Europe, and the weekend was dry bar a few Alpine storms, which thankfully left the races pretty much untouched. The Red Bull Ring is also one of the tracks which most stresses the front tire, with a lot of exceptionally heavy braking, a lot of it uphill.