Clone of virtual machine snapshot fails due to UEFI disk and TPM state

[Phips]

Good morning dear Proxmox community,

unfortunately I am facing an issue.
I have a Windows 11 machine with of course an EFI and a TPM disk.

I just tried to clone the latest snapshot via the GUI so that I can fiddle around without risking my running VM.
Unfortunately this clone fails with the error message:

Full clone feature is not supported for drive 'efidisk0' (500)

From time to time a similar message appears for the TPM.

In the meantime I tried the following to create a backup and restore this backup as a new VM. Unfortunately no snapshots are backed up.

I know that I could simply clone my current working setup and fiddle with the VM with the snapshots but I think this situation might be interesting.
(Also I would like to keep my running VM with the snapshots and not split it up.)

My host is running on PVE 8.2.7 and uses ZFS.

Thanks in advance and br
Phips