Why doesn't a linux machine get ipv6 on startup?

Question

linux

A dhcpv6 server is configured on pfsense 2.6.0 (the same problem was on 2.5.2), the /112 subnet is given to the local network, /128 is given to each device, the RA of the router is managed (RA flags [managed, other stateful], Prefix Flags [onlink , router]). Now to the problem, on all devices running windows 10, ipv6 addresses are obtained immediately upon system boot, when both on debian 11, as well as on arch'e, only calling dhclient helps, mobile devices also do not receive ipv6, how to fix it ?