In 2025.06.06-0019-rolling ((or before, i did not check all releases) it seems there was a major change to net.ipv6.conf.all/$interfaces.accept_ra settings, they are value 0 by default now instead of 2 - Maybe related to? https://vyos.dev/rVYOSONEX563488b1234560cfd3cb5aa9c8ec3f4b7f10d86b

This breaks some lSPs that use only UNSOLICITED Route Advertisements (german ISP "Deutsche Glasfaser" for example) . Deutsche Glasfaser ignores router solicitation requests.
While investigating into the above i noticed another change, when running a longer tcpdump -penni $mywan ip6, I see that on my WAN interface VyOS is also no longer even sending ICMP6 RAs SOLICITS - which is different in 2025.04.17-0018-rolling where i see SOLICITS emitted with the same configuration.

Could one of the VyOS IPv6 experts have a look on these changes and if this in fact the intended behaviour?

My WAN Int configuration:

et interfaces ethernet eth3 address 'dhcp'
set interfaces ethernet eth3 address 'dhcpv6'
set interfaces ethernet eth3 description 'WAN'
set interfaces ethernet eth3 dhcpv6-options pd 0 interface eth0 address '1'
set interfaces ethernet eth3 dhcpv6-options pd 0 interface eth0 sla-id '1'
set interfaces ethernet eth3 dhcpv6-options pd 0 interface eth0.10 address '1'
set interfaces ethernet eth3 dhcpv6-options pd 0 interface eth0.10 sla-id '10'
set interfaces ethernet eth3 dhcpv6-options pd 0 interface eth0.105 address '1'
set interfaces ethernet eth3 dhcpv6-options pd 0 interface eth0.105 sla-id '105'
set interfaces ethernet eth3 dhcpv6-options pd 0 interface eth0.110 address '1'
set interfaces ethernet eth3 dhcpv6-options pd 0 interface eth0.110 sla-id '110'
set interfaces ethernet eth3 dhcpv6-options pd 0 length '56'
set interfaces ethernet eth3 hw-id 'a8:b8:e0:05:96:d8'
set interfaces ethernet eth3 ip adjust-mss '1460'
set interfaces ethernet eth3 ipv6 adjust-mss '1460'
set interfaces ethernet eth3 offload
set interfaces ethernet eth3 ring-buffer rx '2048'
set interfaces ethernet eth3 ring-buffer tx '2048'