I am using UE “4.26.0 Preview 1”, which is installed from the marketplace.
As i create a Geometry Collection through the Chaos Fracture Editor in UE, the created Geometry Collection does only collide with the floor and the wall (see pictures).
The “StaticMeshSimulation” Component doesnt do they job either way. If added to the geometry collections or added to a static mesh, it has unfortunately no effect.