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.
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
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-97763 in the post.