I cannot practice flashcards shared to me by a friend

I am trying to practice Rems shared to me by a friend. Im the past, all I had to do was open the link, and copy his document to my account and then from there I could easily practice his cards. Now, I can copy the document to my account but cannot practice the cards as it says they have already been practiced. In my opinion I should be able to practice cards over and over again regardless of when I last did them. The thing is, though, I haven’t even touched the cards my friend sent. I just can’t practice at all. HELP!!

I’m pretty sure this is a bug, but it may also be related to the shared knowledge bases alpha, e.g.,