Empire Deserter quest: Deserter did not join colony

[Dawnmist]

What happened: I activated the Deserter quest, and was told the location of the outpost with psylink items. The loyalty squad arrived a short while later. The deserter (Doukid) themselves did not arrive, and appear to be dead in the quest window.

Expected: To have the deserter join the colony.

Looking at the logs, the game is now reporting errors saving the pawn that was the deserter:

Trying to save reference to a discarded thing Doukid with saveDestroyedThings=true. This means that it's not deep-saved anywhere and is no longer managed by anything in the code, so saving its reference will always fail. , label=pawn
(Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 35)

Quest log screenshot: https://www.dropbox.com/s/s5p3d451mwmb3kt/20200608151720_1.jpg?dl=0
Log file: https://www.dropbox.com/s/kd0fv1gwp33f7o9/Player.log?dl=0
Mods list: https://www.dropbox.com/s/cbh169jxe40epku/ModsConfig.xml?dl=0
Save game: https://www.dropbox.com/s/bv72z7a3vl9rh8y/Rimworld-RandyTribal2-Kinship%20of%20L%C3%A9gua.rws.zip?dl=0