Vivaldi Browser copy/paste via the keyboard not working? #vivaldibrowser

I've spent quit some time to find out why CMD-C / CMD-V wasn't working in Vivaldi and why the menu was missing all the key combinations, like in this example:
instead of this:
This happened on a fresh install of the latest Vivaldi on macOS Tahoe.

After searching the web and following a few suggestions with global website permissions, preferences file, etc. - which all didn't work - I finally landed on a post that hinted to a shortcuts setting:
In the Vivaldi of the 1st screenshot, it was unchecked.

Checking this setting made the CMD-keys return in the menus.