Mouse over events do not trigger if mouse button is held

Widget events for On Mouse Enter, On Mouse Leave, OnHovered, and OnUnhovered don't trigger if the left or right mouse button is held down when the mouse passes over the widget.

1. Open UE4 Editor (any project)
2. Add Widget Blueprint (OverlapWidget)
3. In Designer tab, add a Button
4. In the Graph tab, wire Event On Mouse Leave to a Print String node
5. In the level blueprint, add Event Begin Play and Get Player Controller nodes
6. From Player Controller node's return value, add Set Show Mouse Cursor node (set to true)
7. Wire Begin Play into Set node
8. Wire Set into Create Widget node
9. on Create Widget node, set class to OverlapWidget
10. From Return value pin, create Add To Viewport node
11. PIE

Result:
Passing over the button with the mouse held does not print the value from the Print String node.

Expected:
When the mouse passes over the button with the mouse held the Print String node prints as expected