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Strange behavior between btBoxShape and btSphereShape in some cases.
Probably corner case of library. Version 3.2.5. I have static cube as btBoxShape + dynamic sphere as btSphereShape.
As image shows sphere not roling properly on inclined box surface if it is rotated 5 - 10 degrees around Z axis. If rotation angle less than 5 degrees or more than 10 everything works good. In my case friction of cube = 2, friction of sphere = 80. I found the more I increase friction of sphere and cube the worse it gets. (sphere bechavior on inclined box surface).