Towards the tail end of a game and noticed a few oddities as things progressed...
1. Plotted a ship to move into an unexplored area near a star. The destination turned out to be a planet. The ship moved to near the planet (my notes didn't mention if adjacent or multiple hexes distant--thinking latter) and then stopped. I watched it for several turns and all it did was show plotted movement into the planet. I'm pretty sure the ship didn't come up in my Idle Ship cycling. I eventually clicked on the ship and looked at it--the plotted movement marker went away and it then came up as an idle ship.
In GC2 I think there was a message that only transports could perform an invasion and the final plotted movement was cancelled. This seems to be missing or circumvented here.
2. I had a ship "stuck" in an asteroid hex. I tried several times to plot movement in one direction out, but the ship never moved. After a couple of turns watching it, I plotted movement out in a different direction and the ship moved. I don't believe this is necessarily asteroid hex related as I've occasionally noticed I couldn't get movement started in other situations.
--David