hello,
solved it for me as a workaround (Apple Watch 4 - watchOS 7.0.1)
1) unpaired the watch from my iPhone XR (iOS 14.0.1)
2) paired the watch with my iPhone agsin and selected a backup from watchOS 6.x
3) reinstalled my missing apps (e.g. Spotify, etc) via "App Store" app on the watch
now there are working on my watch (also got the pine green colour back for the Californian dial)
p.s. unlocking my MacBook Pro with the watch still does not work ..