Did my Uplifted citizens suddenly wipe out the entire population of the planet?

I uplifted a species on a world I was settling. The colony was not yet fully established. Shortly after uplifting, I got a notification that the new Husko species was integrating well and everything was going great! After I closed the message, the colony disappeared and I lost the system. The planet surface screen no longer had any pops at all. I got no further message after the "resounding success" dialog.

Is this a bug, or did my new comrades go crazy with their new found intelligence and suddenly and unexpectedly wipe out everything on the planet?