Valve index not working with adequate TB3 adaptator

[Xaryi]

System: Windows 10
Battery or AC: AC
Model: UX581GV-XB94T
Frequency of occurrence: Always
Reset OS: no
Screenshot or video:
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Detailed description：I ordered a Cable Matters adaptator for outputing dp to a Valve Index .It can output 8K no problem and it has been working just fine with an output to a second monitor but when I try to connect it to the valve, steam VR ask me to switch the screen mode from duplicated to extended. The problem is that everytime I do that it instantly come back to duplicated.
I know this adaptater is working so please don't tell me again to change as I already did that several times. I would like this to work because I need my 3500€ PC to be able to work with VR for my work.

[Xaryi]

[Blake_ASUS]

Hello Xaryi,
I'm really sorry about this.
Your feedback has been reported.
Thank you very much.

[Xaryi]

Blake_ASUS

Hello Xaryi,

I'm really sorry about this.

Your feedback has been reported.

Thank you very much.

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When can we expect something to be made ?