Mesh Painting sometimes fails to paint the closest face in the hovered area

Sometimes it's not catching certain polys as vertex paint targets. Looks like it happens when there's more than one layer of forward facing geometry over the highlighted area, and it just takes the first poly it finds; needs to find all candidates and use the closest one to the camera.

1. Create a new blank project
2. Import "SM_VertPaintTest.fbx" as a static mesh. (make sure you set vertex color import to replace, or override with the override color set to black)
3. Make a new material.
4. Paste the contents of "M_VertPaintTest.txt" into the material.
5. Hook up the commented areas accordingly (should only be basecolor and roughness)
6. Drag the static mech imported earlier into your scene and move it somewhere that you can paint on it.
7. Select the mesh paint mode, and set your paint channel to red, with a color of white with 100% alpha.
8. Set your brush size to something small (2.0) is good.
9. Attempt to paint on the inner circle areas of the mesh, as shown in the attatched screenshot.