OK, for some reason thought i had tested disable all Checksum offload in all interfaces. Apparently not.
Disable TCP/UDP Checksum Offload and IPv4 Checksum offload in the Intel NIC 1000 PT in the host, not the interface created by the hyper-v Switch, i have network again in the OPT1 interface. No need to disable Offload on the pFsense or Hyper-v Interface Adaptor.
Always learning. I need to be more accurate in this testes next time.
Thanks. Cya