I've noticed that recipes which use keys from the Ore Dictionary are not exported to images.
This is probably not implemented because of the fact that multiple items can be registered to that same key (or even none at all).
But it might be useful to try adding them anyways.
I think it would be best feasible by just looking up the first available item that is connected to that key in the ore dictionary and generating the recipe image only for that one and specifying in the item description that any type of that material can be used.
I've noticed that recipes which use keys from the Ore Dictionary are not exported to images.
This is probably not implemented because of the fact that multiple items can be registered to that same key (or even none at all).
But it might be useful to try adding them anyways.
I think it would be best feasible by just looking up the first available item that is connected to that key in the ore dictionary and generating the recipe image only for that one and specifying in the item description that any type of that material can be used.