When I create a new host with multiple NICs, using ovirt or vcenter as a compute resource, the additional NICs disappear from the "network" tab when I click the submit button. I am not filling in the mac address field, since at this point I don't know it yet.

Once the VM is created in the hypervisor successfully, I need to copy and paste the additional NICs mac addresses back from the hypervisor back to foreman. Only then, the additional NICs are saved successfully.

Applies to versions:
-Foreman 1.3.2-1 rpm on CentOS 6.5 (I am almost convinced this worked in earlier versions of Foreman)
-Multiple versions of vcenter and ESX hosts.
-oVirt 3.3.2