Black screen while using Mac native Screen Sharing?

I used OpenCore to install Sequoia to my old Mac Mini and since then, whenever my laptop accesses the Mac Mini through Screen Sharing, it only displays a black screen - though I can still control it.

Sequoia just got a recent update and when I installed that - but before OpenCore was "fetching kdk database" to patch that update - I got picture working again on my laptop.

But after OC finished the process, I get a black screen only again.

Can anyone offer any insight as to what might be going on? I can provide further details if needed

Thanks in advance!