Industrial Revolution 3 overwrites the Lab list with its own set of packs and sets everything to 0 which causes the settings for adding tiberium research to not function.

This can be solved as below

table.insert(data.raw.lab["lab"].inputs, "tiberium-science")
table.insert(data.raw.lab["copper-lab"].inputs, "tiberium-science")
table.insert(data.raw.lab["quantum-lab"].inputs, "tiberium-science")

Not sure if the Quantum lab one is needed as I believe that pulls from the Lab list but added just in case

Tiberium Science shows up correctly with just Tiberium+IR3. Can you post you mod list or share a save file that I could sync to so I can track down the specific mod combination that is causing this? We have a script that adds Tiberium Science to every lab that uses a science pack that shows up on any of our technologies, so mods that change technology costs would be the most likely candidates.