When this random even happens:
"A precursor device found on planet X has been activated by the and has raised the quality of all other planets in the system by 10!"
The main map icons for the other planets do not reflect the change in Planet Quality. In my game, there were 4 other planets of PQ 0. After the event, they all became PQ 10, but still were displayed as an empty circle (like a PQ 0 planet would be).