Did you use a previous saved game or started from fresh, I played for 80 days in game, doing weird things some time, didn't found breaking bug. Just minors things, like wednesday not showing grade status. The fath-lord scene not triggering after some point. I doubt they can do many full playthrough nor have a full bug testing plan because of the sandbox nature of the game, there's just too many ways to do things in whatever order, and the game is far from complete.I have zero experience testing and I have found several bugs and it didn't take long. One dev playing through the update should be plenty. No excuses.
Looks like you don't have much experience in software development either.