TTMSFMXGrid normalcell layout stroke color problem


Editing normalcelllayout stroke color doesn't have any effect.
Steps to reproduce:
- drop TMSFMXGrid on form
- edit default/custom style
- change tmsfmxgridstyle->normalcelllayout colors to black (Fill, Stroke and Font Fill) in Brush Designer.

What I see in Desing and in Runtime are thin white lines that shouldn't be there.

Other cell layouts seem to be working as expected (focusedcelllayout, selectedcelllayout)
Am I missing something obvious? If not, what is workaround for this?

Best Regards