[Therion] Colour map-fg altitude quick shading breaks object colour fills

Hello Forum Just noticed something missing on a few of my maps. Looks like: colour map-fg altitude smooth-shading quick # or default disables the colour filling of objects like rocks and area flowstone. Eg If I turn off smooth-shading OR use a fixed colour or scrap or topo-date shading regime, then the objects are correctly filled. Eg So it looks like a bug with smooth-shading = quick. Perhaps. Bruce