The same for me.
After a restart, DHCPv6 is stopped, no prefix delegation. At some point, out of nowhere, DHCPv6 and prefix delegation are running and all devices have IPv6 addresses. But this only lasts for a limited time, after a few hours the IPv6 disappears again. Restarting only leads to DHCPv6 being stopped again. Unfortunately, 24.7.6 has not changed this.
After a restart, DHCPv6 is stopped, no prefix delegation. At some point, out of nowhere, DHCPv6 and prefix delegation are running and all devices have IPv6 addresses. But this only lasts for a limited time, after a few hours the IPv6 disappears again. Restarting only leads to DHCPv6 being stopped again. Unfortunately, 24.7.6 has not changed this.