The above bug happened after a long play session, I did an egg tutorial with a few failed servings. Then I did a game that went normally ending with serving not properly cooked bacon. then I did a bacon tutorial and succeeded a few times. then I started the run mentioned above.
I think I remember specifically serving that chair bacon in the tutorial, which failed since I put the plate on the counter first then put bacon one strip at a time in front of them. They left after I put the first piece of bacon down. This paragraph I'm about 70% sure on though.