Seen during today's maintenance period where the sites were in read-only mode.
The review pages were unaccessible (since I was logged out), save for the stats (which do not require one to be logged in). However, while trying to access said stats, a pop-up would appear, saying that "an error occured while loading the review item; please try again". It appeared on all queues, not specific ones.
Nothing blocking, but still sounds like a bug since I couldn't reproduce the issue once the sites were up again.
Brave browser 1.27.109, Android 10.
Possibly related to Navigating to review /stats and /history causes the URL to change to a specific review item? (never encountered it myself, then again I don't remember if I went to the /stats page recently)