So i'm not sure if it's just me but when i play on a single-player world with the Dalek Mod (In the Overworld) I can play for ages and see maybe 1 dalek, 0 clockwork droids and just masses of autons spawning right next to cyber villagers (who end up dead because autons kill them) and when mining i don't seem to find any silicone, zeiton-7 either. And also with the masses of autons and cyber villagers, I went into creative and flew over an ocean and for some reason there were loads of autons and Cyber villagers just floating in the ocean 

Is it just me or do other people have this problem?  btw this is with update 47 1.12

Edit: I don't have this problem when playing the 1.7.10 version

Spawn rates were changed, some are going to be changed again in the next update

FWIW, I've had a very similar experience, except I have been able to find the occasional silicone block. Have never found anything at all on the Moon or Telos.

We've actually just fixed this bug. For some reason our world generation code wasn't executing. We've managed to fix it for the next update.

In regards to spawn rates, we've also looked over this and have been making some changes to it as well

That's good to know, thanks :D