Collision not working as expected

I am familiar with collision and have previously setup collision successfully with custom collision objects, but not sure if I am missing something this time around.

I have a sphere player pawn with physics, a static mesh platform and a landscape, Platform is a custom collision object.

What happens: The player pawn (sphere) ignores collision with the platform if I set the Platform static mesh in its actor to Ignore WorldStatic. As soon as I set it to Block WorldStatic the Player pawn will properly collide with it.

Expected behavior: With my settings, I would expect the platform to ignore the landscape and collide with the player pawn.

Wondering if I am missing something due to the player pawn simulating physics? Any thoughts appreciated.

Player Pawn Settings:

Platform Settings:

Landscape Settings: