Feature or bug?

[rawuest]

still using 3.0.9

Character is blinded from eating a mushroom
with full inventory walks onto an un ID'd staff
use the staff and the room display turns black
look and the staff is ID'd as darkness.

Since I already know that telepathy still works even if blinded, from a different character. I would of expected any detection staff to still let me know what is in the range. Any cure staff might end the blindness. But I wouldn't expect to learn the effects of any other staff while blinded unless it teleportation

[rawuest]

Forgot to mention, the visible objects on the floor are still shown on the display

[zaimoni]

As long as the map is updated immediately, this is the logical behavior. [It's comparable to seeing doors open that you don't have line of sight on.]

[MKula]

As long as the map is updated immediately, this is the logical behavior. [It's comparable to seeing doors open that you don't have line of sight on.]

Quoted for truth.
Also similar to walls suddenly vanishing due to a burrower (e.g. Umber hulk) that you don't have line of sight on. It's just the way map and environment behaviour has been programmed.