Diarrhea after breaking fast?

Hey y’all, I’ll Start by saying that I am not intentionally practicing IF. That being said, sometimes my job makes it such that I go 18ish hours without eating (usually say 7pm until 4pm next day, with 8 hours of sleep in there - basically I won’t eat for a whole work day). This probably happens once to twice a week. Usually I will eat on the way home - usually I’ll drink water throughout the day or at least right when I leave, then I will eat whatever my lunch was on the way home (usually leftovers and/or something pretty simple/not too heavy). I’ve noticed that within about 10 minutes of eating I have the sudden urge to have a strong bout of diarrhea. This urge can be uncomfortable bordering on painful and I’ve often wondered if I’d lose continence before getting home. When I get home I generally have a single short bout of incredibly watery diarrhea. Sometimes a second wave follows. Just wondering if this is a normal part of fasting? Of course I’ll speak with my doctor and also try to improve my eating habits - just curious if this is a known thing.