Overview:
Ether canisters can be prematurely destroyed during boss-phase. Next stage is breaking/looting canisters. If canisters are broken before this state next state is unreachable. The mechanism separating these two stages are [i]The Fallen[/i] shields. Shields fail to cover hole in wall.
Broken Mechanism:
The placement of one of the canisters causes it to clip through the floor. The floor is visible on the eastern side. (Right-side as you're entering.) Repeatable.
Fix:
Move canister models up.
-or-
Place wall to cover hole.
Priority:
Low. Easy to repeat quest at this stage. However, due to their placement and with players having to destroy ether canisters in the previous quest, some players might try to break the canisters before they defeat the boss.
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Nice report. Would be even better with video attached ;)