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I did some space combat, attacking and destroying ennemy ships and gained some points in weaponry and targeting. Then I began to aim for ships' systems after destroying shields, then boarding the ennemy ship, and after more than a dozen space battles i didn't get any experience in weaponry and targeting.
It looks like only destroying ennemy ships' armor provide experience in weaponry and targeting. This is quite annoying.
Yes, I have this on my bug list. I'll make sure it gets fixed. Thanks for reporting it.