Belt with immunity to darkness do not work as expected

[sergeil]

Account sergeil, character Beland L

Belt with immunity to darkness don't work. In fact, I expect it provide permanent ultravision effect, but it don't.
Please take a look

[driller]

https://nwn.fandom.com/wiki/Darkness_(spell)

Description: All creatures within the area of effect are shrouded in a haze of darkness which can only be pierced using ultravision.

Account sergeil, character Beland L

Belt with immunity to darkness don't work. In fact, I expect it provide permanent ultravision effect, but it don't.
Please take a look

[Mask-inc]

Darkness immunity never work since the game launch, always been broken, still is.



Mask