12.0-BETA1 vnet with pf firewall

Tested with host running ipfilter and vnet running pf. Tried loading pf 
from host console or from vnet console using kldload pf.ko command and 
get this error message;

linker_load_file: /boot/kernel/pf.ko-unsupported file type.

Looks like the 12.0 version of pf which is suppose to work in vnet 
independent of what firewall is running on the host is not working.