WatchOS 10.6.2 huge battery drain

Hey everyone,

I received yesterday an WatchOS update 10.6.2 for my 1st gen Watch SE. Before the update the battery was fine and it could last for a whole day and night. After this update I faced enormous battery drain. Like, it drops from 100% to zero for three hours.

I tried to reset and unpair the watch. Did it a couple of times (restored them from backup and set them as the new device too) but it didn't helped.

Is there a way to fix the drain? Or downgrade to 10.6.1?