When creating a new studio component (with dash pattern available) and setting the stroke style to Dash or resetting the dash pattern of an already existing one with stroke style set to Dash, will result in a Property Editor showing the dash pattern [0,0,0,0], but the form editor is actually showing a dash pattern. This is caused by the default value for QML ShapePath which will result in [4,2,0,0] (dash pattern documentation). It is set on the ShapePath, but the back-end value which is shown in the Property Editor is not showing the actual value.