My Apple Watch power is draining very quickly after this update - anyone else?
Is anyone having issues with power draining quickly from Apple Watch after latest update?
Yes some other people have said the same too. Here is a good collection of ideas what to look for:
https://www.payetteforward.com/why-does-apple-watch-battery-die-so-fast-fix/
Additionally you could check what happens if you turn Siri off. It can get busy if it's connected to a great number of apps on your iPhone and watch.