I've used to play Oolite several years ago, but it seems my old aegidian account was lost in space.
So I registered a new one.
I think I found a bug, maybe not in Dredger OXP itself. But something has changed since I last played the game (v1.76.1, btw).
Recently I installed a new build of Oolite (v1.82) and some of my favourite OXPs (Deep Space Dredger included). Hunted a ship (Trident Executive Shuttle), then shoot it until the pilot escapes and ship became derelict. Launched a salvage missile, followed the auto-piloted ship to the Dredger, got rid of several waves of pirates. But... on the final approach to the Dredger, the shuttle suddenly stopped, turned off the engine and never moved again. Oops.
I tried this again today. Same system, and Trident Executive again. For this time, all went just fine and I earned my bounty.
So I suppose that something has changed in the game mechanics since 1.76.1 and 1.82, because the derelicts sometimes
got stuck on the final approach to the Dredger ship.
Sorry for bad English.