This may have been something of an edge case, but hear me out.

The first vehicle I built was a traveller and I was interested to use it for trading. Winter hit and dramatically hindered it's performance over rough terrain without my realising, so the driver ran out of fuel before they got him.

Despite my best efforts to wrangle a resupply caravan together in time, our poor trading colonist starves to death -- apparently unable to take the life-saving course of action known as simply-opening-the-door-of-his-car-and-completing-the-journey-on-foot -- whereupon, I can only assume, a flight of angels appeared to take him bodily into Heaven because he vanished instantaneously.

I do eventually merge the caravans, fuel up the traveller, and bring her back to the garage with the new driver. Upon arriving, i am told to bury my colonist. A colonist who disappeared from this mortal coil without a trace. Having no further need for the vehicle I dismantled it, so the game shrugs and tells me I can hold a funeral despite "not being able to recover the body."

This wasn't a bug so much as an oversight; an outcome the developers of this mod did't appear to have planned for.