Dynamic RADIUS VLANs 802.1x on Luci/OWRT 21 help please

Hi guys
Please can you help me.
I will say up front I struggle somewhat understanding with the new bridge vlans setup, but I'm not sure if that's part of the issue.

I have been following this guide:

Essentially I already have a RADIUS server setup working with other APs (Ubiquiti running stock firmware) to hand out the VLAN ID on one of my SSIDs. On OWRT it seems I cannot obtain an IP address when connecting via dynamic-vlan SSID.

I have confirmed a 'vanilla' setup (without dynamic VLANs) that the RADIUS part is working on my AP121's, but the dynamic VLANs doesn't seem to be.

I setup the bridge VLAN filtering on the br-lan (and I can make this work using PSK, by assigning the vlan network to the SSID directly).

I edited the /etc/config/wireless to set it for dynamic vlans (since the options here don't appear on my interface, seems like they didn't get committed to main branch? https://github.com/openwrt/luci/pull/4790 ref WPA2 Enterprise No VLAN in Luci - #3 by thomasthep)

When I connect a device wirelessly to the RADIUS SSID I do see this:

root@ManagedWiFi:~# brctl show
bridge name     bridge id               STP enabled     interfaces
br-vlan205              8000.f09ce9aa7101       no              wlan0.205
br-lan          7fff.f09ce9aa7100       no              eth0

But per the original guide, I should also see a LAN interface on br-vlan205 yes?

If it makes a difference, when there is no Wifi device connected, the whole br-vlan205 line disappears, only br-lan is visible.

I feel like I'm missing 1 last step, but I just don't know what. I did try creating a bridge device and adding interface "br-lan.205" to the bridge port, but that didn't make a difference.
I see in the pull request 4790 that there is reference to the vlan naming scheme vlan or <vlan_tagged_interface>., I tried uci set wireless.wifinet2.vlan_naming = both of these options, and also I noticed the wireless.wifinet2.vlan_tagged_interface='eth1' so I updated that to eth0 since that is what I have, but it didn't improve or change the output of brctl show either.

Any ideas?
Thanks
Jon