Hello,
I have not yet received feedback, unfortunately.
I believe you have compelling evidence of a hardware issue here: it's not up to the computer to add/remove chips from the USB. The dock controller seems to not let the DL chip be there when in USB-C mode.
So, I think contacting Dell technical support and discuss a replacement with them would be the quickest way forward. I will still use that information internally to get the case understood.
Kind regards,
Alban
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