Warppoint = travel neutral zone?

[Dubrok]

Hi,

i observed something strange in my game(early - turn 20 or so). I saw that a new
ship(new race too, so no treaty) had entered one of the systems i had ships in.
nothing special about that, but: in the same turn i sent a ship through the same warppoint in the opposite direction - and nothing happened, no fight?!
it seemed like both ships had entered the warppoint at the same time from the opposite directions and got through unnoticed.
My ship undamaged in his system and his ship in my system undamaged.

I used the replay function to be sure it was the same turn they moved through the warppoint: they did.

Is this a bug or a feature?

(unmodded 1.91 game pbw)

Greetings, Dubrok

P.S.: i am happy my ship wasn't engaged, was a colonizer :-) and he got an armed ship.