Apple Watch showing incorrect battery percentage after update

I've updated my iPhone to iOS 14.6 and Apple Watch to watchOS 7.5 and after this my watch started showing wrong battery percentage. It shows 99-70 percent for most of the day and turns off around the time I go to bed at night. I tried unpairing, turning the phone and watch off/on but none of that helped. When I start charging the watch it says it's at about 60 percent power, but in reality it's 0.

How can I make it show the right percentage?