WinBhyve bridged networking for Win guest not working

I've got 11_STABLE.
Host interface em0 is configured w/ static and is working fine. Win 7 x64 guest.

Did the following:
ifconfig bridge0 create
ifconfig tap0 create
ifconfig bridge0 addm tap0 addm em0
ifconfig bridge0 up

Downloaded Virtio-win-0.1.126.iso, installed for x64 Win 7.

Running bhyve with -s 5,virtio-net,tap0

The adapter is present inside the guest, but won't get an IP and won't pass traffic with a static either. Any ideas?

Try running tcpdump on the tap, bridge and/or em interfaces - guest traffic should be visible on these.
A postscript on this: I wasn't able to get the virtio-win-0.1.126.iso driver working on Win10, and fell back to the older virtio-win-0.1.96.iso which was fine.