The Recipe type in Lumina.Excel.GeneratedSheets (6.0.2 from nuget) has a property UnkData5 which is an array of RecipeUnkData5Obj - these are ItemIngredients and should be called such.
The SaintCoinach def file appears to be correctly naming these - is there anything I can do to help get the proper name into this library? It appears those classes are generated so it doesn't look like a PR to fix the code directly is the best option.