Orthographic Camera Preview window does not render materials

I am using the orthographic camera preview fairly extensively for making an in-engine Tiling Texture maker. This feature is currently busted since the orthographic camera preview window is rendering static meshes as a flat grey color regardless of what material you put on them.

Changing the camera projection to Perspective fixes this, but that is not a solution since you cannot use a perspective camera to set up views for a tiling texture.

The included Answerhub link has images for this.

Upd: Set Regression as NO as previous versions are listed in Affected Versions field

Place a camera actor in a level that has some basic geometry of some kind. Observe materials in camera preview window. Then change detail->projection mode-> to Orthographic. Notice all materials get replaced with flat grey.