Actually, I think it's only when you load a save from within a running game, since I had the assignments survive the initial save-load after starting GC3. However, I haven't tested beyond that one observation.
Hi there, I have a planet with a Precursor Elevator. When I colonized it, I chose the Neutral benefits to the PrecursorElevatorEvent. The +50% income I can see, but not the +50% trade income. Looking at DLC4_ColonizeEventDefs.xml, I see this block: [code="xml"] OnEventChoice Planet Targe
I'm on 2.0, and asteroid mining assignments are reset to the closest colony whenever I load my game. Otherwise, they stay assigned.