Guest died, but he didn't die?

[TNMO]

Just now I have encountered a bug in which my quest fails because one of my sick guests has died, as my pop-up screen tells me. Yet, that pawn (and all other five guests) are still alive and will highly likely survive their illness.

What were the circumstances?

I had 6 colonists with the plague join for 20 days to get healed and then picked up. It would have got me an archotech arm and 55x hyperweave.
All colonists got treated on highest priority and were almost certainly all going to survive.

What happened?
https://imgur.com/a/5YlSXfI

What did I expect to happen?
This message not to appear until the pawn actually died or not at all in case it survives.

Steps we can follow to make the bug appear on our machine.
I have no clue, honestly. I just got this quest, accepted it and bound them to a medical bed until they got healed, or so I thought.

Savegame file and log file
https://drive.google.com/drive/folders/1cjnfobYvCi5hqDkBFjWG5hsDF-eh2Nv7?usp=sharing

I hope this gives you enough information and you can make good use of it.
If you need something more from me, be free to message me for further information about this.