The physics were a surprise to me as well and I moved my design to accommodate them -- I believe it's because of the marble mesh. I might experiment with the Kenney golf ball and see if it that was the reason.
and indeed it does loop. I was going to add some extra stuff to wrap up but lost a day dealing with import issues in UE4 (you need to set physics settings to 'complex as simple' for it to recognize the asset collisions.)