First of all i want to say that i dont know for sure if this is a bug, but at this rate i strongly suspect it.

During the last 6-7 weeks i have been playing the second term dlc and have been working on unlocking the achievments that were implemented during autumn 2019. On december 26 I took note of a cafeteria event between Calculester and Liam, i can't remember the exact details about the event but it was a food fight scenario. I checked my MPlogs now and found the even, this is what it says:

">>WARNING<< ERROR! No suitable cafeteria event found!!!
- Output chosen: Option2Success for 0876: FoodWarTruce"

I dont know what the warning line is about but i left it in there in case it was relevant. Since finding that event (0876) I have not seen it again a single time and I have played well over 100 games since then and always kept an eye out for it.

As I said, I dont know for sure if this is a bug but it does seem statistically improbable that in hundreds of games I would come across this cafeteria event just once. If anyone has any insight into this i would love to hear it.