I checked the wiki thoroughly, and there's no specific information about Maxx Crosby being held out of practice or his status for a preseason game. The wiki does note that a trade to Baltimore fell through back in February due to a failed physical, which raised some health questions at the time — but there are no current updates on him missing practices or being limited in preseason action.
It's possible this is a very recent or breaking report that hasn't been added to the wiki yet. I'd recommend checking a live news source or the Raiders' official injury report for the latest.