Cloth Tycache Export, strange viewport shading on one cloth piece?e

[olika3d]

quick question,
finally made my sim and exported the tycache.
It consists of a few cloth patches binded together.
All have shell on it (in clothbind) and i also checked normals on the birth object.

But the viewport shading is off at just one piece of the clothes.
The other stitched pieces is correctly shaded.
Nonetheless it renders fine but i cannot find a reason what is causing it.

Simple trick to it?
When i switch off "turn GPU instancing" in tycache, both parts turn shitty! ;-)

   

[olika3d]

looks pretty similar like this issue to me (at least the only issue close to it i found in here)
https://forum.tyflow.com/thread-810.html

But i have no instance material in the flow,
i did put a grey material without multimaterial on the base mesh.
Also the don't export matid's won't work like in the linked post.

What really makes me wonder is that just one of the events looks like that in the tycache,
but is exactly the same event like the other cloth patches?

No clue what is causing it

   

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Update:
As always (i knew it already! ;-) ) there was something fishy in my scene.

I did mess around with changing evaluation priority in one event,
because i had the issue that the particle bind in another event won't find the other cloth event to bind to.

When i changed that back and put two cloth parts in one event instead of two,and bind that to the main event,
it works fine again with the tycache export and viewport.

[olika3d]

Update Update

somehow it happened again when exporting the whole tycache, err...
But it goes away when i put a turbosmooth on the tycache.