pure vampire caravans are instantly lost

[jecrell]

According to Jernfalk on Discord, "I'm playing the Vampires mod and whenever I send a vamp travel somewhere via caravan, they form the caravan and then become "incapacitated" and the caravans dissapear shortly after. If I tell the caravan to re-enter the Colony, any vampire in it disappears. (Not using coffins, using vampire-only caravans). Tried a lone vampire, tried 2 vampires, all vanished. Also, I did experience latency issues, but I can't say it's because of the Vampires since I'm running more mods. No mods that would conflict with the vampires, tho. I also tried changing Sun-Avoiding AI before departure and tried to wait until night to leave, no change to outcome. Tried without bringing any items and with items too, same outcome. If I add an animal, all vampires still vanish, animals stay, but caravan can't move due to lack of Conscious Pawns."

[Echoshy1]

Im also having this issue.

[PaintedCat]

I also have this issue, but I can add some features to its description and demonstrate them.
The vampire-only caravan can move if you don't touch it. When touched, vampires disappear.
demonstration
P.S. It's incompatibility with "What The Hack?!"