The ArchVis template's default lux setting for the scenes directional light causes improper rendering on newly created materials and 3D widgets set to Unlit.
Project attached with material made, simply adjust the lux for the directional light to reproduce the issue.
Result: Before scaling down the directional light, the created material does not render correctly. (usually appears black/dark grey)
Expected: The default setting for the lighting to allow created materials to render correctly.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-87109 in the post.