YouTube broke search filters as a temporary fix
support.google.com
support.google.com
I discovered this a few days ago when a band I'm subscribed to announced an upcoming album, and that their agent released 2 songs off of it. Not knowing the agent's name or the new song titles sure made them hard to find since this band has a LOT of significantly older stuff showing up before the 2 new songs finally appear.
I wish they'd just add a 24 hour delay or something less extreme than punishing the legit content makers this way.
Now it's back; it just doesn't work very well.