Expected Result :
You can find the Datasmith option while right-clicking on the material after reopening the Editor
Actual Result :
After reopening the Unreal editor, Datasmith Material option is not found unless you reimport the Datasmith scene from the Content Browser (Watch the attached video capture: Steps.mp4)
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-60196 in the post.