Outside of the fact this event rarely completes because so few folks are ever available when I've been trying to complete this event, tonight it was even worse. The bomb parts portion is bugged. From what folks were saying in chat, it seems this part never gets finished because of the issue with it either not having enough time to get all the parts to the npc or he refuses to accept said parts like tonight. Drop them at his feet and he just does not pick them up....never accepts the parts.
So Anet, how are we supposed to obtain this one item for the legendary collection Nevermore I: Ravenwood Branch when we can never complete the event? This is something I think you need to revisit and see about fixing. It would also be a good idea to review the problems inherent with the event being so cumbersome that we run out of time for the bomb parts and never finish it because of bugs like this. There really needs to be a way for this drop to be available in another way. Having it gated behind a single meta event and having that last bomb part fail consistently, is poor design.
Please fix this problem. I'll never be able to advance to the next collection segment because I can't obtain this one drop. My discussion on this topic is here: https://en-forum.guildwars2.com/discussion/29248/ordnance-outpost-event-chain-to-destroy-the-blighted-tree-in-the-corpse-grove-bugged/p1?new=1