Sometimes, but not always, when I create a Virtual Copy in a Collection, the Virtual Copy will not appear in the Collection, but it will appear next to the file in its folder.
I have not seen that. When I create a virtual copy including a soft proof copy in a collection, so far they have all appeared. Of course, if I make a virtual copy in a folder, it will not show up in a collection unless I put it there. iMac, OS 10.6.8.