Dashed outlines in floor plan of 0-slope roof —bug or feature

[Ignacio Azpiazu]

A zero-slope roof is showing dashed outlines in floor plan. If its slope gets changed to 0.000001 in per ft, outline changes to solid line. I am not sure whether that is a bug or a feature.

[Podolsky]

May this problem be related to floor plan preview mode - projected, outline, overhead?
Choose outline mode - then it will always show the contour.