Thank you for the bump.
So, the pictures are very useful. It should be a software problem but it's the first time this has been reported on Mac as far as I know.
The logs show some puzzling things but nothing that can be connected to this behaviour.
I'm afraid that the only way to analyse this issue is to have the affected setup and debug it directly, I don't know how to help you remotely.
We'll give it another go in trying to reproduce the issue with a very similar display and setup.
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