Xiaomi AX3000T using the latest version of the snapshot, but this has been happening for a long time in other versions.
When you set the 5GHz wireless channel to auto, and restart the router, the IPv6 on the client devices stops working, but on the router the IPv6 ping works, and if you make any configuration changes on the wireless or network settings, the IPv6 on the clients returns to work.
Using the auto channel on 2.4GHz wireless this problem does not occur, and if you select a manual channel on 5GHz, IPv6 works on restart.
Xiaomi AX3000T using the latest version of the snapshot, but this has been happening for a long time in other versions. When you set the 5GHz wireless channel to auto, and restart the router, the IPv6 on the client devices stops working, but on the router the IPv6 ping works, and if you make any configuration changes on the wireless or network settings, the IPv6 on the clients returns to work. Using the auto channel on 2.4GHz wireless this problem does not occur, and if you select a manual channel on 5GHz, IPv6 works on restart.