The first thing is about population. I was playing as Sophons. It was early in the game. There were a lot of pacifists in my empire so I decided to investigate. I found out that in my home system were several Haroshems. They came out of nowhere! Later I found them. They were in neighbouring constellation. Pretty far away. I find it a bit weird. 

The second thing is space batte. Sometimes , when I want to watch them the battle view disappers. And when it does , the battle does not count as a finished one. Unable to get to next turn. Have to save and reload. Also there were times when the same thing happened when I quit in the middle of the battle. The battle never finishes. Reload cures it.

Hope that it will help.

About the Haroshem - the immigration mechanic is currently in place in a very unfinished state. The devs have said that they'll update it during the EA (so hopefully soon)