NetworkManager stymies me again

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I was finally going to try to setup my network using nm
in fedora 32. I figured after 10 years or so all the
bits I use might finally work :-).

But, I've defined a bridge with (seemingly) all the
same properties as the fedora 31 bridge I created
with network-scripts, yet my virtual machines using
bridge networking never get an IP address, as if the
router dhcp server never sees them.

Is there some magic I'm missing to make things on the
bridge visible on the physical network?

Here's the commands I used to setup the bridge:

nmcli con show
nmcli con add ifname br0 type bridge con-name br0
nmcli con add type bridge-slave ifname eth0 master br0
nmcli con mod br0 ipv4.ignore-auto-dns yes
nmcli con mod br0 bridge.mac-address xx:xx:...
nmcli con modify br0 bridge.stp no
nmcli con down "Wired connection 1"
nmcli con up br0
nmcli con show

The bridge gets an IP address from the router, but virtual
machines do not:

<interface type="bridge">
  <mac address="52:54:00:1c:57:9f"/>
  <source bridge="br0"/>
  <model type="virtio"/>
  <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>
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