Threads are cut that way because no clipping was set, and for the overlapping one of the base "tile"'s end had to be rounded.
Added the animation just to emphasize these are all strokes and no fills (...all killer no filler?).
For realism cast shadows would be the first step which with this setup would need using clones to mask other clones at least.
It's just the 14th variation... maybe will come back to it sometime.
Like if it was converted to a pattern fill, no clipping would be necessary.
In general was looking for a stylish pattern, rather than a photorealistic one. Aimed for a functional woven fabric instead of all the existing mocked patterns though.
Previous variant was more black&white
which was closer to in nature to a previous variant:
-with this kind of stylization the outlines are cut in half at the edge between dark and light, which may not look the beston a pattern fill.
Then, made a series where either the light or the dark outlines are at the top visually: