enemy mines not disappearing

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enemy mine icon is not removed after conquering the system

also side question
what is guard stance?

I'm wondering about the guard stance as well, seeing that even if you do not use guard stance and an enemy attacks, you're engaging them. Hmmm!

@ashardalon maybe it stops them from simply going through a sector i.e. forces and engagement over letting them go to the system behind you.

@imptastic pretty sure the enemy doesnt follow the same rules as the player so has no need to move past
they only attack like they are doing in the image above with a clear warning arrow
so dont think that can be it