There are 3 places I know of there that will trap you ..... two of them by the Teleporter on the first tier near the NW Teleporter.... And one over the ankh same tier.... that one has no escape....
Anymore I carry teleport scrolls on me when I go there just incase I get stuck one of the holes on the NW.... You can teleport out of them if your alive.... someone can rez you if you die in that hole but it can be tricky. They have to stand I believe SE of your location... to "see" you.
But your right it needs fixing.