Collisions doesn't work at BeginPlay against Instanced Meshes if their Mobility is Static

User reports that in 4.8 in some cases bodies for Static-mobility ISMC instances are not yet initialized when BeginPlay is called.

It seems like deferred creation for level streaming should be complete before BeginPlay occurs.

Jack: It's a regression in 4.8 breaking user gameplay code.

Open the attached project and run PIE.