By the way, it is called "Flügelüberdeckend" and means that the door leaf surface is flush, i.e. the panel does not recess behind the frame profile of the door leaf. The lighter the material, the more noticeable the shadow of such an edge is, which is especially avoided in houses of cubic form in the "Bauhaus style" to not disturb the planar clarity by constructionally caused but not intentionally designed structuring. Since this mostly applies to the outside, this overlap is often omitted on the inside. Mostly because of the disadvantage of a significantly higher price. Profile manufacturers like to use specialized panel manufacturers as suppliers. Since the profiles have manufacturer- and model-specific total thicknesses, double-sided door leaf overlap is particularly complex. Single-sided overlapping can use the panel design more as a "stock size", double-sided will practically be a custom-made item, also in thickness. No one does that "for next to nothing."