The most unhinged ways to transport items and yourself around your factory. Fling items around with Thrower Inserters, launch your trains off ramps, and soar through your base on electric ziplines!
I thought this problem only applied to plutonium reactors from the Cerys mod, but after pulling wires, mods, and my hair, I discovered it was applying to all machines.
Ejector hatches couldn't be used because I couldn't put them on any of my machines.
After pulling more mods, I discovered that the bug has nothing to do with Cerys. It appears to be caused by the Planet Omnia mod.
Mod interaction: Planet Omnia prevents Ejector Hatches from being placed on buildings.