Yes, I also found that out not long ago.
From what I remember, it didn't really look like bone fragments though- unless the bones got melted together. All of the residue was on top of the rest of the meat and looked almost like a layer of something filmy. It was weird, and looked like the food went bad or something. I know bones aren't bad for cats, but you do have to avoid or limit them with certain medical conditions because of the phosphorus levels.