Colonists disappearing on a quest event map

[mountainmen1]

I was doing an item stash or bandit camp quest and wasn't paying attention to map expiration time after I killed the hostiles. I built transport launchers and was going to use them to travel back home. I had 5 people there and I assigned 2 to be loaded with some loot. Map expired in the middle of the task and the screen for reforming the caravan popped up. Colonists that were in process of entering transport pods weren't on the list to reform the caravan, only 3 others and the entire colony got "colonist banished x2" mood debuff meaning they got automatically banished.

[Calahan]

I don't think this is the same as this Mantis bug: https://ludeon.com/mantis/view.php?id=3141

But linking it just in case (since that report does imply to be on the lookout for signs of that bug happening in B18).