Blend on origin geometry is supported.
Correct application: The Create new chamfer/rounding [New Chamfer/Fillet...]... command is displayed.
Blend on derived pattern geometries is not supported.
Incorrect application: The note "Area was created by a pattern feature [Face is a result of pattern feature] " is displayed.
When following the correct procedure, the Blend feature is applied to the origin geometry and all derived pattern elements.