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Sure thing. I used the following section from Thread Border Router - Bidirectional IPv6 Connectivity and DNS-Based Service Discovery  |  OpenThread :

If you are trying to reconnect Wi-Fi or restart Ethernet interface, make sure that dhcpcd is not used for managing your WiFi-/Ethernet IPv6 network. Because dhcpcd always overrides the accept_ra option everytime the interface is restarted and your accept_ra configuration will be lost.

Append below lines to the dhcpcd configuration file (e.g. /etc/dhcpcd.conf) to explicitly disable IPv6 in dhcpcd:

noipv6
noipv6rs

You need to reboot to take the change into effect.