Just happened to me on Day 14 of an AMBIENT playthrough (wanted to make that part extra clear). Most events are disabled in this mode, so it's interesting to see this event still happens. I guess that means the event isn't exactly dangerous. I also remember one time where, as someone else mentioned, the Kerfur-O reappeared after roughly 30 real-world minutes. I also know this can happen if the Kerfur is nearby when you sleep. Seems the only safe methods would be A, put them in your inventory (the Monique model is capable of this, as she has the same properties as the doll when deactivated), or B, to potentially leave them out in front of your base idling. Basically, it's a cognito hazard. One time I was cleaning a transformer and had a Kerfur-O set to patrol. Noticed after a bit they hadn't run inside in a while, and found the blood splat. This specifically happened several versions ago, probably during v0.6.X or v0.7.X.
That's pretty much everything I've got