How is it possible?

How is it possible that the AI in a dark universe, with Hyper range to reach a star but without the scan range to see it can attack me?

That unpredictable abilityhas a huge impact on my game!

Not necessarily a bug. I have seen the AI send ships back at you in retaliation many times, even when they can’t scan your star. If you send a force that it considers a large amount, I have seen the AI send troops back in retaliation.