Jump Duct Installed

Once again, thanks for the wisdom of more experienced inspectors. I recently encountered a jump duct from master bedroom to a hallway, terminating inside the return air duct in the hallway. I understand it’s purpose, my question is; should it be filtered on both ends?

Does not need to be filtered at all. In fact, a filter would likely hinder the intended air pressure balance.

Thanks Brian, I was thinking 2 filters was definitely too many, and wondered if even one was too much.