Kanye West’s apparent rant against “Watch the Throne” collaborator Jay Z at a concert has shocked hip-hop pros.

“I was shocked to hear what Kanye said onstage. There was never anything rumbling . . . so when you hear these things in public, it’s a little shocking,” Jay Z’s Roc-A-Fella Records co-founder Kareem “Biggs” Burke told us at his “Reasonable Doubt” 20th anniversary pop-up shop/exhibition.

West blasted someone presumed to be Jay Z for not visiting Kanye’s family after wife Kim Kardashian’s Paris robbery, adding from the stage, “Our kids ain’t never even played together.”

Burke told us: “The last I saw [West], he spoke really highly of Jay. I’m not sure about the relationship at this point. I spoke to Jay [after Kanye’s rant] and we’re both just like, ‘We miss the old Kanye.’ From what I know of Kanye, he’s usually really honest. So it sounds like something he’s going through right now. He may [say] something like that, and then three weeks later he may be back to, ‘That’s my brother.’ But at this point, with everybody’s career, we’re a little too old for rap beef.”

Hear Kanye’s concert rant: