Pending OP Response M.2 drive not showing

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Sargan

PCHF Member
Nov 15, 2021
5
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67
New PC build … using Gigabyte X670E Aorus Master

I have a Corsair 2 TB M.2 PCIe-5 module in the primary M.2 slot (slot 1) and working fine.

I have a 2nd 4 TB M.2 module (WD_Black) that is PCIe-4 that I wish to use in slot 2 (PCIe-5 slot)
It does not show in W11 Device Manager or in Disk Management.

If I move it to slot 3 (PCIe-4) and it comes up in W11 fine. (same if in Slot 4)

As PCIe-5 is supposed to be fully backwards compliant, what do I need to do to get this to work ?
I have tried various support forums the only suggestion is that this is a BIOS issue, no BIOS settings have been changed.
Want to use slot 2 as it has direct access to CPU not the storage controller, so maximum speed, and signalling.