Reveal in Finder in N10.3 on Catalina

Reveal in Finder Command does focus on finder but no directory is opened, no file selected. Im sure it s about the security system in Catalina.
But Nuendo has Full Disk Access given in MacOs preferences.
There is a tread about the same problem in Cubase Forum. The advice given there to disable Nuendo Preferences does not help in my case. Any other ideas?

Thanks Oswald

I did set up a support ticket for that issue 5 weeks ago and never did get any answer at all. What is your experiencw with Steinberg Support? Is that normal?