Single input machines can't craft a recipe that takes concrete and another fluid.
My specific problem is with the Batch Plant mod that requires concrete and lubricant to craft, tried to exclude the recipe with "batch-plant" but didn't seem to work.
Bumping this cause I ran into the same problem with the refined concrete in foundry recipe, it's asking for concrete mix, molten iron, and water. Personally I'd balence it by dropping the water need and boosting the iron, but hey it's your mod
navintoast: The mod does specifically try to avoid this, but evidently it failed in this case. I found a solution for this and can release a fix shortly.
WorkWaffle: This sounds like a recipe added by another mod, so however the recipe is set up is not an intentional choice.
The issue with the batch plant only being craftable in the batch plant should now be fixed!
(There may be another issue with input-output fluid connections not being counted, since it seems like the fluid inputs for the category was calculated to 0 which isn't technically correct, but I'll leave fixing that for another day if it ever comes up... depending how it works it may require even more complex logic)