Line thickness is always one when using the "Draw Line" node

When using the Draw line node the line thickness will not change. The value appears to always be equal to 1.

1. Open the Editor
2. Create a new widget blueprint
3. Create an OnPaint override function
4. Create the blueprint in the attached image (the line thickness is 100)
5. Open the level blueprint
6. Add the widget to the viewport
7. Play in Editor
8. Make a note of the line thickness
9. Open the widget blueprint
10. Change the line thickness for the Draw line node to 1
11. Play Click play in editor
12. Notice there is no difference in the thickness of the line

Expected: The line would be thicker when set to 100 as apposed when it's set to 1
Result: The line thickness does not change