I assume, that differences between limiting contour and the hatch are inaccuracies of the drawing unit.
So I think that shouldn't matter, if they even exist at all.
Especially at high zoom levels the entities on the screen may not exactly match the underlying math.
That means when you look at the zoom level, the appearing gaps are presumably a fraction of the whole part.
At an appropriate scale the gaps will be invisible or not existent.
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