That's what I mean.
Netflix in my understanding does not preview coming attractions in cryptic terms through it's search in my experience.
It bases their search function on existing programming.
So "untitled blackpink documentary feature" in my assessment would refer to something that already exists (that they just don't have on the service). Likely the programing system didn't have name and it came up with this topical descriptor to refer to it.. as a placeholder.
The only thing I can think of is it refers to BLACKPINK House. And somewhere in the programming it wasn't properly coded.
Or..... I'm just dead wrong.
And BLACKPINK's getting a Netflix documentary!!!!