The bonus mission about finding out more about what happened prior to the player's arrival on M4-78 was left in a state impossible to complete when I did not ask the maintenance droid in the industrial zone about the "missing" turrets prior to talking to ES-05. I loaded up a save from before I had talked to ES-05 for the first time, went back and progressed the mentioned mission further and then talked to ES-05 and I was able to complete the mission.
The droid in charge of cleaning got permanently stuck outside the shack in the industrial zone after the conversation he had with the maintenance droid there. He does not go back to his original location.
The maintenance droid in the industrial zone appears to be stuck in front of his console instead of being in his shack. This becomes especially strange when you can ask him about the droids he is working on, yet he's not even in that room with the broken droids.
The crime scene with the droid that got aggressive seemed to never reset. The droid that was aggressive along with the "police" droids never left the place, looking very dramatic, until M4-78 became active again. Perhaps intentional.
The escort droids were a bother. They often would not escort me to places that I had already unlocked. And the central zone one wouldn't take me all the way to the environmental zone. I think after activating M4-78, it started working properly.
Also I experienced some lag/stutterings in this mod, mainly on a few locations. Not on other planets. (I know there's a thread on this. I haven't read it.).
I did not start TSLRCM+M4-78EP with a new save file. I may even have used earlier versions of the mods on a previous TSL installation (I recently installed TSL again and started playing after a 4 year break, using save files from 2011 stored on my external hard drive), though I installed the mods well before reaching Korriban and M4-78, and for the rest of the playthrough it went pretty bug-free.
Oh, and why did the droid in the environmental zone, the one that had changed its own programming, why did it not sound robotic?
M4-78 Enhancement Project v1.2
The Sith Lords Restored Content Mod v1.8.4
I also have NPC Overhaul and Kill the Ithorian. GOG Windows 10
Oh, and, you know, super amazing mod.