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Surface-Bodies will not appear in drawings unless you specifically tell it to. Because the modified is a surface body, it will not appear in the drawing. Only the solid body extrusion will.
Also, your surface body is already one surface, so it cannot be "knit" to anything. Try Insert>Boss>Thicken.. and choose the "create solid from enclosed volume" (also keep merge result checked). This should convert the surface body to a solid body.
All is well with the world again.... Thanks