[0.18.1700] Colonist in caravan won't self-tend

[XeoNovaDan]

Overview
I sent some transport pods over to an item stash, and promptly cleared it out with the two colonists sent over.

Contents of the transport pods are as follows:
- around 340 pemmican
- Skye and Carlotta
- A juvenile dromedary
- 1 luciferium pill
- 30 herbal medicine

Upon reforming the caravan and heading back, the tend utility kicked in and Skye (the doctor) healed Carlotta - so far, so good. However, at this point, I didn't set Skye to self-tend, so that's something on my behalf. By the time that I notice this, I set her to self-tend when most of her injuries have mostly healed, but she still doesn't self-tend despite being set to self-tend and receive herbal medicine treatment.

However, this did work fine in the past when I wasn't so late to set a colonist to self-tend, so it could just be to do with the game detecting that no injuries are going to be potentially lethal - but it'd still be nice to get that last bit of treatment done quicker.

Link to save file since it's too large to attach

Expected outcome
When a colonist's set to self-tend, they'll tend to their own injuries, even if mostly healed.

Actual outcome
No self-tending happens.

Steps to Reproduce
Note: Haven't actually tried reproducing this bug, but the following steps are possible steps to reproduce:

1) Make a world incident (item stash in this case)
2) Spawn a bunch of colonists, make sure one's a skilled doctor
3) Dev mode an instant caravan formation, and dev mode instant arrival at incident
4) Clear out the incident and reform caravan. Make sure that the doctor sustains some injuries beforehand
5) Head back to base; wait a while
6) Set the doctor to self-tend; observe that the doctor doesn't self-tend

[ison]

Fixed (though after A18), thanks!