Physics mesh does not sleep when it lands on skeletal mesh

When a physics mesh lands on a skeletal mesh, it will never go to sleep.

1. Download and extract the attached project.
2. Open the project in editor.
3. Play in viewport.

RESULT

The static mesh falls on the skeletal mesh, but even when it rests on it, the string printed reads "true" (it's getting the value of Is Any Rigid Body Awake).

EXPECTED

For the mesh to eventually sleep (string to print false).