New a worksheet and set row numbers to X and Y
Highlight ColB and plot a 3D Ribbons graph
Open Plot Details and go to the Pattern tab
Under Fill Color, select ‘By Points’ and then Y-Value: Color Mapping
==>The entire ribbon is red, color mapping does not work.
Go to Border Color and select ‘By Points’ and then Y-Value Color Mapping
--> Color mapping for border color works.
Fixed in Origin2026.