This seems to be a problem from both the V5 and V6 iOS clients. I had a friend add “Chantal Akerman Vol 1” (barcode 5035673015308) to his collection as it is a simplified box set which contains child Movies rather than child disc Titles, in order to test a Friends Collection search for a child Movie title. He later deleted the box set. However, when I look at his Collection all of the child Movie titles are still shown under “Recently Added”, even though the parent record is gone.

I informed my friend of this, but he says he cannot see any of these parentless child Movie records. Not under “Recently Added” nor when he sorts, nor when he attempts to search his own collection by title. It would appear that there might be some stale information cached from my previous Friends Collection view on my side. How would I go about clearing this?