This bug is irritating me now because I cannot get it to occur reliably unless I actually make an attempt at setting up a real colony. What I have discovered is that a minimal interaction play until you get to the event seems to cause it to fire guaranteed. (8/8 tests where I set the game to fast forward, unforbid food and left the game running until Day 4 Hour 6). If I try to actually build a colony I occasionally encounter the bug. Deliberately reproducing this bug is difficult, but I did find that an error similar to the one Calahan occurred in my latest test colony which DID have the event fire properly, the error was "Invalid count: 0, setting to 1. Job was HaulToContainer A=Thing_Steel25330 B=Thing_Concrete_Blueprint25308 C=Thing_Concrete_Blueprint25304"
https://pastebin.com/PmVktW8J
https://pastebin.com/PmVktW8J