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I did try that interface but in my experience nothing was being mirrored. After I switched off the firewall and used the tap interface, the packets were being mirrored.

Found the solution in this page: https://github.com/0xvext/proxmox-seconiontap.sh/issues/1 Essentially, be sure to turn off your firewall for that second switch, that way the tap interface for it is visible in OpenVSwitch; if you don't do this, the tap interface will be a Linux switch instead.