The biggest problem I see is with watchOS 26, there seems to be a bug in the way distance is calculated when adding workouts. When I use watch to 5k, as it switches from walk to run and back pace and run go haywire. Ve tried resetting fitness calibration to no avail. Never had this on the previous watchOS. This bug was there right from the early watchOS 26 betas.
My walk average pace is around 9.3 and my run is around 6.5 but see how it has calculated a super fast run and a super slow walk.
Anyone else seeing this?