No Boot after installing RDS on Windows Server 2025

Hello, I have a very strange problem with Windows Server 2025 and RemoteDesktop-Services.

What happened:
Installed a Domain-Controller with Windows Server 2025 on Proxmox 8.3.0 - used virtio 0.1.266 and everything works fine.
Installed a 2nd Windows Server 2025 and joined Domain.
Then I installed Remote-Desktop-Services.
The installation initiates an automatic reboot - and the reboot fails - starting automatic repair.

There are no disks visible when using diskpart in command prompt in...

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