Vertical dimension gives horizontal dimension if horizontal distance greater than vertical

Rhino Rhino for Windows
1

I am trying to dimension two points. Their vertical dimension is smaller than their horizontal dimension. Even though I select vertical dimension, Rhino adds the horizontal dimension instead.

Version 6 SR15

2

Looks like this is already known to be an issue: https://discourse.mcneel.com/t/dimension-bug-rhino-v-6/