This likely bug has occurred for me on at least two runs:

You finish the town and make it into the next section. There is a guardtower along the trail to the encampment. If you are perceptive, you can sometimes see a pitfall trap in the tower. If you don't set it off and go into the pit, you immediately wind up in the window in the last royal section. You can then hunt in there, get the boss, and enter the final battle. All of the areas are then accessible, without having to defeat any more bosses. You can therefore finish the quest in 10 minutes if "finishing" is defeating the empress/emperor.

It's not a big deal, of course, but I can't imagine this is an intended outcome.

Tarakan

Retser:

You zapped that one trap's bug, but didn't fix the problem generally. There is another pit in the same section closer to the gate to the next section that creates the same teleportation to the window room in the last section. You probably need to check each trap instance for the same flaw.

Tarakan