builder drones vanished. bug?

[Vertigo 7]

I bought a mammoth, added a bunch of modules to my station and set it about building it last night. Made some further renovations this morning and assigned the mammoth to start building again and I noticed it had 1 builder drone. I had 70 something of them yesterday... It appears that the drones vanished after the build job was completed.

[Alan Phipps]

Is the game vanilla and, if so, do you have saves before and after the drone loss that you could upload and link so the devs could take a look?

Without the saves and further game information and in-game location/situation/recent history for that Mammoth, it is unlikely that the devs would be able to help.

[Vertigo 7]

yes, unmodified game but I don't have before and after saves. I'm attempting to reproduce the issue.

[Imperial Good]

Reproduction might involve being on the construction ship or being nearby the construction ship. It may also involve being nearby when construction finishes. It may also involve flying at speed nearby the construction ship.

Non-combat drones will self destruct if they stray too far from their launching ship. For example if one has an Odysseus Vanguard with Exceptional chassis and forward thrust mods installed and the ship is damaged with repair drones deployed then starting travel mode in sector will result in the loss of all repair drones as they get left far behind and self destruct.

Drones do not exist out of sector. Hence this should never be a problem under such condition.

[Vertigo 7]

I haven't been able to reproduce it but the mammoth never left the sector. was maybe 10km outside of the station plot that i had it working on and I was never aboard the mammoth, it was going to take a few hours to finish the station changes so i let it run and went to bed. The following morning is where i found that it only had 1 drone remaining. I've since restocked the drones and had it engage in 2 separate large build jobs to the same station and it did everything it was supposed to do.