x86 platform v4.48.4 or v4.49 stable version, the network port is built in a bridge, and the device can be directly connected to the mikrotik network port to obtain ipv6, if it is connected to an unmanaged switch below, it cannot be obtained. And if you use an ASUS router to connect to an unmanaged switch, you can get it correctly. The ipv6 of the two routers are all stateless configurations.
thanks !