Game Mechanics: see invis (to undead) undeads

[DoucLangur]

Since one of the recent patches, sebilis (crypt) now seems to have undead mobs that see through IVU - I just got harmtouched by one, and my IVU faded due to the harmtouch.

For all I can recall from kunark era classic, you could move through crypt with IVU like you could here on p1999 until some months ago.

Was this maybe a mistake when more see invis mobs were added to sebilis (which, btw, will make the zone hard to navigate for duos/trios)?

Kind regards

Slozem