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Yep the bridge port is definitely not excluded from LAN, all LAN peers are also on WAN in Neighbors - Automatic Discovery.

When packet capturing my WAN physical interface, I saw Router Advertisements from my router, even though I have set interface to LAN in Dnsmasq (both General - Default and DHCP ranges). How to fix this?

My WAN interface is PPPoE for IPv4 and DHCPv6 for IPv6 on igb1 (I packet captured igb1). The igb1 port is connected to the ISP ONU in bridge mode. However the ONU is also plugged into my switch (with a LAN port) because the modem also has AP functionality. The ONU port that connected to igb1 is bound to the bridge mode connection.

p.s. Although I don't remember this happening in 25.7, I now suspect the bridge port was not excluded from LAN during ISP configuration. I'll reply to this post if I manage to get the modem's admin account.

When I refresh the WAN connection in Interfaces - Overview, sometimes Router Solicitation is not sent, which caused the router to have no IPv6 address for itself. Why and can I fix this somehow?

My ISP expects routers to configure its address with SLAAC and request prefix through DHCPv6-PD, no address can requested via DHCPv6 or the gateway will reply with an error with no prefix given. The gateway also sends Router Advertisement very infrequently but responds to Router Solicitation.

[modes]

I understood it as "Setting Router Advertisement modes in DHCPv6 ranges will have no effect without this global option enabled."
In the DHCP ranges for IPv6 there are several modes, e.g. SLAAC, ra-stateless etc.

What would be the correct way forward?

I added an IPv6 range like this, not sure what the default for new installs is...