Looks like it's bugged right now. Tooltips use the same method in the ESO UI source code, and right now all tooltips are returning just "Food" or "Drink" instead of the specialized type.
Specialized item type didn't exist until a little while ago and not every item is tagged with its specialized type yet since there's a huge amount of existing items to go through. It's something we want to do as soon as we have the time.