If you have 2 stacked staffs of perception, one of them will unstack due to the charges after use. However, if you have the 2 stacked, and are trying to ID a different staff underneath them in your inventory, they will unstack and then the ID spell kicks in, thus IDing the 2nd staff of perception (instead of the intended unknown staff).
Not a big deal, but slightly annoying once in a while. Thanks
Stacked Staffs of Perception
Re: Stacked Staffs of Perception
A temporary fix is to inscribe the staves differently so they don't stack in the first place.