Proxmox - (real) disk usage on ZFS-R10?

Hi there,
i'm setting up our first Proxmox-Server with ZFS RAID 10 (6 NVMe's) and have a question regarding to the (real) disk usage.
Actual, the ZFS-Pool consumes 1,13 TB. If i summarize all virtual disks of my VMs, i get abound 1 TB.
The disk usage inside the VM is primary at ~50%, so the real used disk space is about 500GB.
All VMs have the qemu-guest-agent installed (primary Windows-Servers).
I've checked "Discard" and "SSD emulation" on all virtual disks.

I thought, ZFS would only...

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