Good point, I didn't even know that was a property! Thanks for the pointer. :)

I've added it alongside the meat tag - isMeat is used by Minecraft only determine whether a wolf will eat the food. That's why I think it's good to have a tag, to include things such as spider eyes and fish, which are not edible by wolves.

What's the status on this? Foods with isMeat don't appear to be working.

This seems to have gotten lost when I switched to the data-driven power system. Will re-add this in the next update, sorry for the inconvenience.