I try it but it looks like a visual bug because indeed the shield on moth formation is there but the damage is like heart formation and if something is shooting at you,the shield is going down so i don't think that it is shield on moth,it is on heart but the game just show you the moth instead the heart.
there is no real bug, he need to change to the other configuration and the visual bug disappear.
happens with all formation, havocs, hercules and all visual from another ship