Using the Food Expansion mod by Lellson, the soups from their mod cannot be stacked with Quark's stackable soups enabled. Is there a way you can add compatibility for other mods' soups? (Also the Food Expansion mod tries to add stackable soups, but the feature has to be disabled due to a common bug that the author hasn't yet fixed, so that isn't a solution)

This can be fixed easily on their end.