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Because the brake is a constriction, it will slow the pressure drop in the barrel a little, but I don't expect it to be much. I don't expect there to be enough change of resistance to make the gas column in the barrel bounce back and forth as a pressure wave
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Like I said I won't call it one way or the other. Far fetched but possible if you look at the pressure waves following the bullet.
https://www.youtube.com/watch?v=BPwdlEgLn5Q
If I take the brake off and it immediately cycles we know the brake was the issue, if it starts cycling after 20 or 30 rounds of Wolf there was gas leakage. If the .223 upper on the same lower cycles we know the lower is good. Just a matter of eliminating everything before returning