AC87U - Setting Vlan results in no access to web admin

[orion2]

This router is driving me crazy.
AC87U running v378.50 of the Merlin firmware.

Running the following is now resulting in no access to the web admin interface (I'm still ssh'ed in):

robocfg vlan 1 ports "1 2 3 4 8t"
robocfg vlan 3 ports "0 8t"
vconfig add eth0 3
ifconfig vlan3 up

NVram was cleared so there shouldn't be any conflicts there. Now the crazy thing is that at one point this was working. I was running into issues with later commands but I was not losing access to the web admin.

It looks like the ports are all configured correctly to me:
****@RT-AC87U-6C98:/tmp/home/root# robocfg show
Switch: enabled
Port 0: DOWN enabled stp: none vlan: 3 jumbo: off mac: 00:00:00:00:00:00
Port 1: 1000FD enabled stp: none vlan: 1 jumbo: off mac: d4:9a:20:fc:f5:76
Port 2: DOWN enabled stp: none vlan: 1 jumbo: off mac: 00:00:00:00:00:00
Port 3: 100FD enabled stp: none vlan: 1 jumbo: off mac: 00:30:bd:03:80:e1
Port 4: DOWN enabled stp: none vlan: 1 jumbo: off mac: 00:00:00:00:00:00
Port 8: 1000FD enabled stp: none vlan: 1 jumbo: off mac: ac:9e:17:45:6c:98
VLANs: BCM5301x enabled mac_check mac_hash
1: vlan1: 1 2 3 4 8t
2: vlan2: 8t
3: vlan3: 0 8t
1045: vlan1045: 0t 2t 3t 4 7t 8u
1046: vlan1046: 0t 2t 4t 5 7
1047: vlan1047: 0 1t 4 8u
1099: vlan1099: 1t 7
1100: vlan1100: 0t 2 4 5 8t
1101: vlan1101: 1 3 4t 7 8t
1102: vlan1102: 0 1t 5t 8u
1103: vlan1103: 1t 2t 8t

Edit: on a whim since I still had SSH I took the next steps:
brctl addbr br1
brctl delif br0 wl0.1
brctl addif br1 wl0.1
brctl addif br1 vlan3
ifconfig br1 192.168.10.200 netmask 255.255.255.0
ifconfig br1 up

And now I can reach the web admin again. Still confused and a bit worried as the behavior seems unexpected. I believe I am doing everything correctly but if I am not please point out my error(s).

Related: Which start script is the earliest that I can run these (safely), I tried init-start and that seems to have unintended side effects.