ToME: the Tales of Maj'Eyal

I just found a set of 3 weird pedestals, that I've never seen before. I investigated 2 of them, and killed the invokers they spawned. However, I can not investigate the last one. It has a shining chest on top. I did open that, but I do not get the pop-up to investigate the third pedestal.

Did this break something? What would happen if I could investigate all 3 pedestals?

Investigating all 3 pedistals should cause another bigger miniboss to appear.

Definitely an issue with map generation, though.

Perhaps glowing chests should completely disappear after they are opened.