Preview Scene Setting Environment Color only shows as black in Niagara editor viewports
This issue does not reproduce in the Material, Static Mesh, Skeletal Mesh, Anim BP, or Control Rig Editors.
Result: The Preview viewport's Environment Color stays black
Expected Result: The Preview viewport's Environment Color should match what is set in Preview Scene Settings
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-93144 in the post.