If you go to the object menu and click spawn prop from convex hull, you will get an object that is visible that will show what is happening.  A did a test with the primitive bowl and it does have a top. 

If you watch the video about bullet physics it talks about the problem with objects not hitting the target before being deflected. It also says Nerb3D was going to discuss work a rounds in a future video.

My work a round would be to place a bunch of flat planes inside the bowl and use them instead of the bowl.  Each object appears to create its own convex hull.  I just did a test with 5 planes and a ball .  The planes were angled to form a crude bowl and the ball bounced inside it like it was real and not stopping at the top as in your video.

 

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13