Looking at the template used by the 9-slice control, this is caused by using RenderOptions.BitmapScalingMode="NearestNeighbor" to reduce the chance to see overlapping lines in the joins of the different slices: <Style TargetType="noesis:NineSliceImage"> <Setter Property="Te...

Thanks for bringing this up. Vector feathering isn’t currently supported in our renderer because Rive’s implementation of this feature is tightly coupled to their own custom renderer. As a result, it’s not available through the Noesis integration at this time. For simpler cases, we recommend using ...