Although I know this assertion can sometimes be incorrect and may eventually be removed, I’m currently unable to reproduce the issue and would prefer to have a reproducible case before removing it, just in case something else is broken.

Could you please attach a repro XAML?

<MyNamespace:MyShapeClass StrokeDashArray="2,2"/>
Where the PlanetaryBorderControl is a Shape-derived control.
When setting StrokeDashArray to any value other than 0, Noesis throws an assert:
GenJoinGeometry -> NS_ASSERT(IsOne(Length(outDir)));
Setting it to 0 does not cause an assert.

Hi!

Without knowing what is MyShapeClass I can't reproduce. Any chance you could take the geometry from MyShapeClass into a Path element to see if it reproduces?