Inconsistency in VLAN handling

[Fail-Safe]

I have three VLANs in my network, one of which is untagged (1) and the other two of which are tagged (9 & 99) on the physical device wan.

Snippets from /etc/config/network:

config device
	option name 'br-lan'
	option type 'bridge'
	option stp '1'
	option igmp_snooping '1'
	option ipv6 '0'
	list ports 'lan1'
	list ports 'lan2'
	list ports 'lan3'
	list ports 'lan4'
	list ports 'wan'

config bridge-vlan
	option device 'br-lan'
	option vlan '1'
	list ports 'lan1'
	list ports 'lan2'
	list ports 'lan3'
	list ports 'lan4'
	list ports 'wan:u*'

config bridge-vlan
	option device 'br-lan'
	option vlan '9'
	list ports 'wan:t'

config bridge-vlan
	option device 'br-lan'
	option vlan '99'
	list ports 'wan:t'

Upon device reboot, bridger reports the following VLAN-related output:

# cat /tmp/bridger_log | grep -E '(Add|Update|Remove) vlan'
device_vlan_add(285) Add vlan 1 to device br-lan
device_vlan_add(285) Add vlan 1 to device br-lan
device_vlan_add(285) Add vlan 9 to device br-lan
device_vlan_add(285) Add vlan 99 to device br-lan
device_vlan_add(285) Add vlan untaggged pvid 1 to device lan1
device_vlan_add(277) Update vlan 1 on device lan1
device_vlan_add(277) Update vlan untaggged pvid 1 on device lan1
device_vlan_add(285) Add vlan untaggged pvid 1 to device lan2
device_vlan_add(277) Update vlan 1 on device lan2
device_vlan_add(277) Update vlan untaggged pvid 1 on device lan2
device_vlan_add(285) Add vlan untaggged pvid 1 to device lan3
device_vlan_add(277) Update vlan 1 on device lan3
device_vlan_add(277) Update vlan untaggged pvid 1 on device lan3
device_vlan_add(285) Add vlan untaggged pvid 1 to device lan4
device_vlan_add(277) Update vlan 1 on device lan4
device_vlan_add(277) Update vlan untaggged pvid 1 on device lan4
device_vlan_add(285) Add vlan untaggged pvid 1 to device wan
device_vlan_add(277) Update vlan 1 on device wan
device_vlan_add(277) Update vlan untaggged pvid 1 on device wan
device_vlan_add(285) Add vlan 9 to device wan
device_vlan_add(285) Add vlan 99 to device wan
device_vlan_add(285) Add vlan untaggged pvid 1 to device wl0-ap0
device_vlan_add(285) Add vlan untaggged pvid 1 to device wl0-ap1
device_vlan_add(285) Add vlan untaggged pvid 1 to device wl0-ap2
device_vlan_add(285) Add vlan untaggged pvid 1 to device wl0-ap3
device_vlan_add(285) Add vlan untaggged pvid 1 to device wl1-ap0
device_vlan_add(277) Update vlan 1 on device wl0-ap0
device_vlan_add(285) Add vlan untaggged pvid 9 to device wl0-ap0
device_vlan_add(277) Update vlan 1 on device wl0-ap1
device_vlan_add(285) Add vlan untaggged pvid 99 to device wl0-ap1
device_vlan_add(277) Update vlan 1 on device wl0-ap2
device_vlan_add(277) Update vlan untaggged pvid 1 on device wl0-ap2
device_vlan_add(277) Update vlan 1 on device wl0-ap3
device_vlan_add(285) Add vlan untaggged pvid 9 to device wl0-ap3
device_vlan_add(285) Add vlan untaggged pvid 1 to device wl1-ap1
device_vlan_add(277) Update vlan 1 on device wl1-ap0
device_vlan_add(285) Add vlan untaggged pvid 9 to device wl1-ap0
device_vlan_add(277) Update vlan 1 on device wl1-ap1
device_vlan_add(277) Update vlan untaggged pvid 1 on device wl1-ap1
device_vlan_add(285) Add vlan untaggged pvid 1 to device wl1-ap2
device_vlan_add(277) Update vlan 1 on device wl1-ap2
device_vlan_add(285) Add vlan untaggged pvid 9 to device wl1-ap2

However, if bridger is restarted, whether manually or automatically (via respawn), this is the resulting VLAN-related output:

# cat /tmp/bridger_log | grep -E '(Add|Update|Remove) vlan'
device_vlan_add(285) Add vlan untaggged pvid 1 to device lan1
device_vlan_add(285) Add vlan untaggged pvid 1 to device lan2
device_vlan_add(285) Add vlan untaggged pvid 1 to device lan3
device_vlan_add(285) Add vlan untaggged pvid 1 to device lan4
device_vlan_add(285) Add vlan 99 to device wan
device_vlan_add(285) Add vlan 99 to device br-lan
device_vlan_add(285) Add vlan untaggged pvid 9 to device wl0-ap0
device_vlan_add(285) Add vlan untaggged pvid 99 to device wl0-ap1
device_vlan_add(285) Add vlan untaggged pvid 1 to device wl0-ap2
device_vlan_add(285) Add vlan untaggged pvid 9 to device wl1-ap0
device_vlan_add(285) Add vlan untaggged pvid 9 to device wl0-ap3
device_vlan_add(285) Add vlan untaggged pvid 1 to device wl1-ap1
device_vlan_add(285) Add vlan untaggged pvid 9 to device wl1-ap2

In the case of a service restart, why does bridger not give indication that VLANS 1 & 9 are added to devices wan, br-lan, and wl*-ap*?