Tiberium Control Nodes (Beacons) do not apply any bonuses to e.g. Growth Accelerator - I've noticed this some time after researching Level 4 of "Tiberium Control Network Power" but I'm not sure if that was exactly the trigger; however, it worked before. It might be also the fact that I tried to grow Tiberium on a space platform, building "Tiberium Control Node", which caused the space platform to request 32k normal "speed module 2" with the auto-construction-request (another bug?). Researching Level 5 didn't help. ("Enable All Planet Mods")