Is this behaviour straight ?

I don't want to talk about the present boss of IMF, but of SW, with the joined sketched file

to constrain the 2 points spline of the joined PRT, I can make the spline tangent to right horizontal, or perpendicular to right vertical.

The second solution gives an error, when the first works.

And I don't understand why such behaviour is appearing in SW

SolidworksSketching