Hello, I turned on the both stroke and fill option for the material. It seems like the stroke is half transparent and the fill color becomes darker blue where stroke and fill intersects. Also, the stroke does not become solid black. It becomes dark grey. Add images
Stroke Edit Mode — Blender Manual
2D grease pencil painting I made using the new Stroke Outline feature ( Blender 3.5) : r/blender
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Convert grease pencil strokes to an extruded mesh preserving stroke thickness - Blender Stack Exchange
2.79 —
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