@rmilecki Above, I've posted my originally working config before migration.
I've manually migrated to this working config. Sorry, I wasn't able to pull off what the config looked like after LuCi automated migration.
config interface 'loopback'
option device 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
config globals 'globals'
option ula_prefix 'fd63:8f35:a549::/48'
config switch
option name 'switch0'
option reset '1'
option enable_vlan '1'
config switch_vlan
option device 'switch0'
option vlan '1'
option vid '1'
option description 'default'
config switch_vlan
option device 'switch0'
option vlan '2'
option vid '10'
option ports '0t 1t'
option description 'XXX'
config switch_vlan
option device 'switch0'
option vlan '3'
option vid '30'
option ports '0t 6t 1t'
option description 'XXX'
config switch_vlan
option device 'switch0'
option vlan '4'
option vid '40'
option ports '0t 6t 1t'
option description 'XXX'
config switch_vlan
option device 'switch0'
option vlan '5'
option vid '50'
option ports '0t 6t 1t'
option description 'XXX'
config switch_vlan
option device 'switch0'
option vlan '6'
option ports '0t 6t 1t'
option vid '133'
option description 'XXX'
config switch_vlan
option device 'switch0'
option vlan '7'
option vid '134'
option ports '0t 6t 1t'
option description 'XXX'
config device
option name 'br-vl10'
option type 'bridge'
list ports 'bat0.10'
list ports 'eth1.10'
option igmp_snooping '1'
option igmp_v3 '1'
config device
option name 'br-vl30'
option type 'bridge'
list ports 'bat0.30'
list ports 'eth1.30'
option igmp_snooping '1'
option igmp_v3 '1'
config device
option name 'br-vl40'
option type 'bridge'
list ports 'bat0.40'
list ports 'eth1.40'
option igmp_snooping '1'
option igmp_v3 '1'
config device
option name 'br-vl50'
option type 'bridge'
list ports 'bat0.50'
list ports 'eth1.50'
option igmp_snooping '1'
option igmp_v3 '1'
config device
option name 'br-vl133'
option type 'bridge'
list ports 'eth1.133'
option igmp_snooping '1'
option igmp_v3 '1'
config device
option name 'br-vl134'
option type 'bridge'
list ports 'bat0.134'
list ports 'eth1.134'
option igmp_snooping '1'
option igmp_v3 '1'
config interface 'VL10'
option proto 'static'
option delegate '0'
option ipaddr 'XXX'
option netmask '255.255.254.0'
option gateway 'XXX'
option broadcast 'XXX'
list dns 'XXX'
list dns 'XXX'
option device 'br-vl10'
option ipv6 '0'
config interface 'VL30'
option proto 'static'
option delegate '0'
option device 'br-vl30'
option defaultroute '0'
option ipv6 '0'
config interface 'VL40'
option proto 'static'
option delegate '0'
option device 'br-vl40'
option defaultroute '0'
option ipv6 '0'
config interface 'VL50'
option proto 'static'
option delegate '0'
option device 'br-vl50'
option defaultroute '0'
option ipv6 '0'
config interface 'VL133'
option proto 'static'
option delegate '0'
option device 'br-vl133'
option defaultroute '0'
option ipv6 '0'
config interface 'VL134'
option proto 'static'
option delegate '0'
option device 'br-vl134'
option defaultroute '0'
option ipv6 '0'
config interface 'bat0'
option proto 'batadv'
option routing_algo 'BATMAN_IV'
option aggregation '1'
option ap_isolation '0'
option bonding '0'
option fragmentation '1'
option gw_mode 'off'
option log_level '0'
option orig_interval '10000'
option bridge_loop_avoidance '1'
option distributed_arp_table '1'
option multicast_mode '1'
option network_coding '0'
option hop_penalty '30'
option isolation_mark '0x00000000/0x00000000'
config interface 'nwi_mesh0'
option mtu '1532'
option proto 'batadv_hardif'
option master 'bat0'