Bug in Engwithan livestation dungeon

[TedMosly]

Hello, i think i found a bug in quest: "the storm of poko kohara" --> passage: " search the ruins of poko kohara" , 

in the second level of Engwithan livestation dungeon (after the gigant boss)  i can't open the door for the third level. I spent many hours exploring the first and second levels of the dungeon, but there are no keys that open that door. The only two aternatives are:

 

1) have enough skill to open the door

 

2) use the cheats "unlockall"  in the console command  to open the door

 

i have also attached a screen 

[dbn]

There is a skeleton that contains that key on the far side of the room with the spiders.

[TedMosly]

There is a skeleton that contains that key on the far side of the room with the spiders.

i have check ALL the enemies drop in the dungeon, and the key was not there

[Kehnee]

In the room Collapsed Hall there's a skeleton remain who has the key on it.