Pretty sure this is a recover from backup event but want a second opinion

[Farout]

Passing through a HBA used to be enough until this:

Can't import datapool

IIRC there is currently a bug / bad design decision in proxmox where it auto-imports zpools into the host OS. If the zpool is currently imported / in use in a guest as well this will cause pool corruption. ZFS is not a clustered filesystem and so it cannot be consumed by both host and guest simultaneously. IIRC the only way to avoid the data corruption is HBA passthrough. @HoneyBadger has more details.

Now it is advised to blacklist the HBA aswell.