FreeBSD from VMWare to Proxmox.

I'm trying to find out how to fix some of the issues that we have with one of our migrations.
Moving from VMWare to Proxmox is straight forward but trying to get the BSD based VM to boot afterwards is not.
It seems to loose (or change) its drive properties along the way and this causes the VM to boot with Read Only filesystem.

Does anyone have enough experience with BSD to help?