I was reviewing some suggested edits and some other posts on SO today.
Aftera short while I have exhausted by contigent of reviews for the suggested edits queue. As I still wanted to do some other reviews, I stumbled upon a minor bug.
Despite not being allowed to do any reviews, I got the topbar indicating that there is pending reviews. I took a screenshot (and edited it to decrease the size by removing all the other review queues from the image).
This did not happen all the time, but could be reproduced by using the review link in the topbar now and then.