Error ipv6 on AP device r7800

[Thang]

Because my English is not good, I will use gg to translate, hope everyone understands.
I am using 2 r7800, and 1 r7800 running in the same error AP mode as the case of this member. Is there any way to solve this problem? Thanks everyone!

I'm using an AC68U with the most recent Merlin firmware.

In wireless repeater mode it isn't routing IPv6. Clients connecting to the repeater get their ip6 addresses from the main router. But can't ping even the dhcp router that gave them those addresses.

A similar setup with the repeating router wired works fine, even though the asus AP doesn't get an IPv6 address. IPv6 clients work in passthrough mode to the main router.

The repeater works otherwise. How do I get IPv6 clients to route correctly on the wireless repeater?

Thanks