New PVE install on encrypted debian

Hi, I am about to repurpose an old computer as a NAS/Homeserver and wanted to try Proxmox for this.
Since I want the system partition to be encrypted, I checked this guide, which basically says to setup Debian encrypted and then install Proxmox VE according to this wiki entry.
Everything went fine so far, I followed all recommendations in the Debian installer and got the LVM setup where a small partition is unencrypted so I can boot grub and then decrypt the system partition to...

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