Installation of SSD breaks network

Hi

I have a Minis Forum MS-01 which I use as Proxmox Server.
Installed is a 1TB SSD in the first NVME slot. Proxmox works perfectly in this setup.

I have freed a NVME SSD drive which I want to use now in this machine. I have therefore installed the 2nd NVME SSD in the 2nd slot.
When I boot the machine with both SSD's installed, then I have no network anymore.

I have the output form `ip -a` in the spoiler when only 1 SSD is installed and unfortunately I can't upload a screenshot...

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