Mod versions: nullius 1.4.8, attach-notes 0.5.1, Transport_Drones 1.0.7
Symptom: When these modules are enabled at the same time, building a request depot with a fluid (e.g. hydrochloric acid) recipe will cause the depot to erroneously work in item mode (no fluid output, bogus HCl items in the output slot).
Investigation: The attach-notes mod defines a hidden item for every type of fluid in its prototypes/signals-to-items.lua. The Transport Drones mod defines a request-XXX recipe for every type of non-hidden item and every type of fluid in its data/make_request_recipes.lua. Nullius' override-mod-final.lua modifies these request-XXX recipes, but now that XXX names both a hidden item and a fluid, the code got confused. It shouldn't have recognized the recipe as an item recipe if XXX is merely a hidden item (since the Transport Drones mod skips hidden items as well).
Although attach-notes has not yet been made compatible with Nullius, it is potentially useful, and it is hard for ordinary users to diagnose such a bug. So I think it is worthwhile for Nullius to avoid this bug by making the aforementioned code in override-mod-final.lua more rigorous.
