Some objects missing shadows in the scene

I was checking the models I uploaded to ShapeDiver, and I noticed that some shadow of a geometry is missing.
It’s a couple of cables hanging on a screen. And one cable doesn’t have the shadow, but the other one has.

And sometimes it’s the right side of cable missing the shadow.

And in some cases, there is no shadow for both of them.

And sometimes both of them are there.

Is there any reason it appears randomly?
Is it related to the size?
The cables are quite thin, like 6mm in diameter.

I’m curious to know how to fix it.

Please share your ideas. Thanks1

We could reproduce the issue and are looking into it, thank you for reporting it.

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