Material Billboard Component doesn't respect screen size when taking into account Camera FOV and AR

Material Billboard Component skews when Camera's Aspect Ratio is changed, and varies in size with changes to the Camera's Field Of View.

Reported in version 4.25.3 (CL-13942748) and tested in versions 4.24.3 (CL-11590370) and 4.25. Working as expected in 4.24.

1. Create an object with a Material Billboard Component
2. Create a new Element under Sprite in the Material Billboard
3. Add a Material to the Billboard(ex: a blank image with a circle in the center)
4. Set Material Billboard "Size Is in Screen Space" to true
5. View this object through a Camera
6. Adjust the FOV of the Camera, the size of the object increases or decreases. This can fill the entire screen
7. Adjust the AR of the camera, the shape of the Billboard distorts

Results: The size of the Billboard in each direction is affected by the changes made to the Camera's Field of View and Aspect Ratio. 

Expected: The shape and size of the object is uniform to screen size independent of the AR and FOV