Went out last night for a nightfall and thought I'd meme it up a little and see how well Wish-ender did as a barrier option. To my surprise, the weapon hit the champion's barrier just once. I thought that this was odd and went to double check it. Turns out, the anti-barrier mod for bows breaks the broadhead perk and if i had to guess why, it would probably have something to do with the overpenetration that the anti-barrier mods give to their weapon types. The video I have linked should demonstrate the break pretty well.
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I've also noticed this bug.