When I try to copy/paste nodes inside the stage it a) copies in the wrong nodes which b) can't be deleted and c) which can't be undone by CTRL-z. Anybody else the same problem? 20.0.547 here.

Saving and reloading the scene enables me to delete the nodes, but this is the only positive aspect here.

Just checked in 20.0.547, and it works fine overhere.