When a building is on fire, and you prioritize putting the fire out, they go about their daily business, like hauling materials to the stockpile.
What was on fire?
If the colonist can't reach the fire they wont' bother trying (path blocked or its in the middle of the building)
My main base.
The acted as if there was no fire.
Never mind. I forgot to set the home zone.
no problem.