Network configuration doesn't manage an interface in LAN without mesh VLAN tagging properly
Configuring an interface (e.g. eth0) as LAN and disabling mesh VLANs on it:
config qmp 'interfaces' option mesh_devices 'eth0 eth1 wlan0' option lan_devices 'eth0' option no_vlan_devices 'eth0' option wan_devices 'eth1'
causes BMX6 to be configured to mesh via the interface (i.e., eth0):
interfaces: devName state type rateMin rateMax llocalIp globalIp primary eth0 DOWN INACTIVE INVALID INVALID /-1 /-1 0 eth1_12 UP ethernet 1000M 1000M fe80::20d:b9ff:fe33:98d5/64 fd66:66:66:53:20d:b9ff:fe33:98d5/64 1 wlan0_12 UP wireless 6222K 56000K fe80::6f0:21ff:fe33:db03/64 fd66:66:66:57:6f0:21ff:fe33:db03/64 0
which fails to work, since the interface is part of the bridge and can not be used.
Using br-lan instead of eth0 would probably be the most convenient option, even if another interface (e.g. eth2) configured as LAN with VLAN for mesh would then both mesh with and without VLAN.