I see notifications on Apple Watch 6, but now I can’t open them to read them?

If your Watch isn't working right, you might first want to try restarting it.

How to: Restart your Apple Watch - Apple Support

or

If you haven't already, you may want to try updating to the latest watchOS 9.5.1

About watchOS 9 Updates - Apple Support

Else:

If needed: You might want to reach out to the Apple Watch Support Team.

There is a "Get Support" link (scroll to the very bottom) on their webpage (link below)

Apple Watch - Official Apple Support

All the best :-)

Thank you for letting us know you solved the situation. Cheers :-)