Road suddenly uses 100% of caravan's resources

[hopeseekr]

Version: Rimworld 1.2 and 1.4.

I have a huge work caravan with more elephants than you can shake a stick at. Seriously, it'd take you several days to count the elephants with a stick ⭕

The caravan has 119,241 kg of supplies, including 59,511 pieces of steel, 32,000 of assorted stone, 10,000 wood, and ~12,000 chemfuel. 1 human. The caravan is overloaded by 19,241 kg.

The road construction was paused for some time (I think a year) while the colonists stripmined a nearby mountainous area.

When construction resumed, the caravan immediately gave the "Out of Resources" notice for converting a stone road to an asphalt road, and the caravan lost 100% of its stone blocks and weight is immediately reduced to 52,251 kg.

I've had this happen several times.

What doesn't work:

1. Splitting the caravan. The main caravan still empties all the stone blocks on the next tile build.
2. Cancelling the road and starting over (same thing).

What does work:

1. Send the entire caravan into a settlement.
2. Resend the caravan.