In this Shaqtin example at 1:40 into video, Portland player 11 Leonard takes a rebound, drops passes to no one and picks the ball and then immediately passes.
The Pass to no one, is just a dribble. Leonard picks the ball up after it bounces, so valid dribble. He didnt dribble prior and he disposes the ball immediately after regaining the ball in 2 hands. No double dribble , no travel.
Why is that a violation ?