Second Butch trebuchet volley MIA?

I don't know if anyone here uses trebuchets on Butch, but if so, has anyone noticed the second volley of 2 shots (after quickly weapon switching) failing to register? It's happened a few times now that I've noticed and was wondering if it's a documented problem or not. I'm almost positive it's not a shield bot quickly turning their shield to block after the first volley, and there hasn't been LoS interruption either. I might be wrong, so don't take my word for it. Was just curious if anyone else had experienced anything similar with any of the Wild Bunch crowd.

Edit: If this is the wrong topic area, go ahead and swap it over wherever it belongs.