Wing exploration: how is it supposed to work?

ok so, been flying with my friend in wing of late, decided to do a little exploration, and this is where it gets odd, basically:

Scenario 1: 2 vipers, one without any exploration tool, other, my friend with basic discovery scanner.
Result: when my friend scanned with his scanner, I discover what he has discovered.

Scenario 2: later on, me in my a cobra with advanced scanner and detailed scanner, friend in his basic scanner and detailed scanner.
Result: when I use discovery scanner, he does not get anything, when he does I don't get anything?

Scenario 3: me in my cobra again, friend with only detailed scanner, no discovery scanner.
Result: when I use my discovery scanner, he does not get anything.

What is going on here? am I missing something on how it should work? I really don't get it?
 
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