I have changed NICs and get the same result.
$ ifconfig lagg0
lagg0: flags=8843 <up,broadcast,running,simplex,multicast>metric 0 mtu 1500
options=8009b <rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,linkstate>ether 00:21:9b:fc:d4:fd
inet6 fe80::221:9bff:fefc:d4fd%lagg0 prefixlen 64 scopeid 0xb
inet 192.158.25.19 netmask 0xfffffc00 broadcast 192.158.27.255
nd6 options=21 <performnud,auto_linklocal>media: Ethernet autoselect
status: active
laggproto lacp lagghash l2,l3,l4
laggport: bge1 flags=0<>
laggport: bge0 flags=0<></performnud,auto_linklocal></rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,linkstate></up,broadcast,running,simplex,multicast>