A recipe can be crafted when it shows no number in the corner, an ingredient is red, and there is an alternative ingredient recipe available.
Why is this a bug? :
The behavior I've always seen and expect, is when there is a not-used-in-the-decomposition-cost recipe for an ingredient, the recipe is clicked and says "Not enough ingredients." A test mod (trying to reproduce the bug) repeats the expected behavior, but somehow, my current mods *don't* behave the same way.
Unfortunately, I only encountered the bug playing with PyMods, which is not a small reproduction.
1) Here is a modified Advanced Electric, which provides the new recipe/item and, in data, promptly returns so only that gets added.
2) PyMods. Full modlist and versions:
mod listpypostprocessing might be slightly tweaked, and stdlib is out-of-date (1.4.7 vs 1.4.8) but I wouldn't expect any differences to cause this. I can use original versions if the bug is irreproducible.
1) create a freeplay game
2) run command:
enable recipes, give items
3) Craft Small Electric Pole MK2 even though you "can't".
Quickly tested data-final-fixes code which does not reproduce the issue:
looks similar in game but does not trigger the bug