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

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)

Click to expand...

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

In the meantime I tried the following to create a backup...

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