WIFI LEDs not working since 6.x

Dear Turris Forum,

since update to TOS 6.x WIFI LEDs do not shine anymore.

Please see my config:

# cat /etc/config/rainbow

config led 'all'
	option status 'auto'
	option color 'white'
	option brightness '010'

config led 'power'
	option status 'enable'
	option color 'white'

config led 'lan_0'
	option status 'auto'
	option color 'green'

config led 'lan_1'
	option status 'auto'
	option color 'green'

config led 'lan_2'
	option status 'auto'
	option color 'yellow'

config led 'lan_3'
	option status 'auto'
	option color 'yellow'

config led 'lan_4'
	option status 'auto'
	option color 'cyan'

config led 'wan'
	option status 'enable'
	option color 'red'

config led 'wlan_2'
	option status 'auto'
	option color 'magenta'

config led 'wlan_3'
	option status 'auto'
	option color 'magenta'

The LEDs are not broken, I can see them shining in white, green and blue on rebooting the router. Different brightness or colour does not make a difference. Restarting rainbow throws errors:

# /etc/init.d/rainbow restart
Command failed: Not found
Command failed: Not found

What could I do to have WIFI LEDs shining on activated WIFI?

List of rainbow devices shows different device names (dash instead of underscore), but using these in /etc/config/rainbow does not work alltogether, resulting in all lights being white and at 100% brightness.

# rainbow -l
power
lan-0
lan-1
lan-2
lan-3
lan-4
wan
wlan-1
wlan-2
wlan-3
indicator-1
indicator-2

We know the problem, check the forum.