I tried setting everything to guard so i wouldnt have new idle colonies and it just hung up on the same turn. Moving ships had no effect on turn state.
It is a larger map but with everything just guarding and my only final opponent without military capacity i just have worlds to invade to finish it up. I parked all invasion ships outside the worlds they are meant to invade and holding. Turn button just says wait after that. There is a lot going on the the map but everything is just holding atm.
It's just a weird bug, Hopfilly they can find the cause. The save file i sent in reproduces the issue every time