I'm often finding that when mirroring many of the connections get broken or changed on the side parts are mirrored to. This is extremely frustrating, especially in big, complicated builds where there's a lot of nudging and connection editing and maintaining symmetry manually is a bit**.
I have read that this happens when your cockpit is off center (duh!), but I have tested this making sure I never move the cockpit and it still happens.
Is this a bug or am I doing something wrong?