It's been 6 years, and it's still bugged. Salvage damaged armaments to build bombs event at North-west Verdant Brink

[Zappax.4685]

This step in the meta progression is bugged since it's inception. Often times salvaged parts can't be turned in, and if there are a lot of players, the scaling and the bug together prevents completing the event and continuing the chain altogether.

https://wiki.guildwars2.com/wiki/Salvage_damaged_armaments_to_build_bombs