After the current save has been running for a while, sometimes the Dupes will not actually make Mush Bars even if they deposit the resources. If you reset the food production qeue, they may make Mush Bars again, or not, it is irregular. I saved, exited to menu, loaded the save and suddenly they start making Mush Bars again. Other food productions are completely unaffected by this.
I've ran into this bug several times.
Steps to Reproduce
Run a game without exiting it for some random amount of hours.
This issue has not been confirmed by a developer yet.