It has come to my attention, and my group that if you place the bombs near each other on the door at this part of the dredge fractal, when one dredge picks up a bomb, all 5 will get picked up at the same time, resulting in no bombs being left to go off,
We tested this a total of 5 time, and each time, if even one dredge got to the bombs to pick it up, all 5 would be picked up at the same time by that single dredge.
When the bombs were separated across the face of the door, this possible bug did not occur.
I do not know how long this has been around for, however I have never seen it happen before today, thus the conclusion of a possible bug.