The baked-in assumption that only the first item in the list is the trigger item should be made explicit. For example by extracting it out into a catalyst field in the recipe.

Also re-consider how the particle effects are applied. They show up even if no valid recipe is present.

See: https://github.com/AppliedEnergistics/Applied-Energistics-2/blob/master/src/main/java/appeng/recipes/transform/TransformLogic.java#L61

What recipes are these talking about? I thought AE didn't add any fluids.
Is it these master/recipes/transform?