Need to wipe Instances config without enabling to avoid boot loop

What did you pass through in TrueNAS to create this issue?
If you were to pass the same device through to a virtual machine running on Proxmox, what would happen then?

Finally, are you aware of the risks of running a virtualised ZFS pool in Proxmox (which in turn is ZFS-aware) and how to mitigate said risks?

Btw, this may be relevant: