Required item indicator for Sand Mushrooms in Sarven desert doesn't point to anything

I tried to start Sand Mushrooms, but couldn’t get it to tell me what the required item was.
The yellow pointer is at the bottom of the inventory selection window, and no matter where I scroll to, it stays there.
It looks like the required item is a pet bird, not a pet cat since the pet has to fly over the river to gather potions.

Yes, you need the raven. Just click on it and then select, Play.

I figured that out, but the bug seems to be that the pointer to a required item isn’t actually pointing to anything useful.