Bug: "This is not a StrongBox"

Was in labyrinth. Came upon an unidentified rare StrongBox. Tried to ID it with a scroll of wisdom, got the very weird failure message: "This is not a StrongBox."

Tried twice more, same message. Alt-tabbed out to report bug - couldn't remember the exact wording of the error message, so alt-tabbed back in to repro one more time. This time the scroll identified the box, no problem.

Weird. Do you have Magritte writing your error messages now?

That's the message you get when you try to use currency on Perandus boxes. I guess the game thinks that's what those strongboxes are?