After 7.37 update no Google assistant with Oppo find x3 pro

After 7.37 update the google assistant is no more available with Oppo Find X3 Pro.
During the setup of Garmin Connect (when re-associating) now appears a screen indicating this incompatibilty.

When I press the voice assistant button on the watch it says "no smartwatch connection" although the watch is properly connected to the phone and syncs without an issue.

I'm running 7.37 on venu 2 plus and oppo coloros 12 on the phone.

Please help.