Yeah I noticed it as well

I have seen this also, and it required an action similar to de-orbiting from a colony. So another possibility, since there are some new things about starbases, is that the constructor gets docked at the starbase similar to going into orbit at a colony planet, just like any other ship, and the movement is needed to allow it to do the update function. If this is the case, I have a suggestion: Add an option for leaving a starbade to allow an update function along with the eject option if the ship you are trying get to leave a starbase is a constructor.

It's a programming thing: events like that are triggered by moving onto the same space as the base to be upgraded, not being on the same space - the game only checks for that while the ship is moving, it doesn't check when it's sitting still. I've had the same thing happen in GC2 to survey vessels - a wormhole dumps them directly on another anomaly, but they don't pick it up until they move off and run back into it.

Me too. Which is why I made the suggestion above.