Juniper Router – How to Configure Router Advertisements

I am currently setting up IPv6 on my network ran by a SRX-240H2 as router. Besides others the router as an internal interface configured as follows:

[edit interfaces ge-0/0/4 unit 802]
clb@srx01-av# show 
description "Management V-LAN";
vlan-id 802;
family inet {
    address 192.168.224.254/22;
}
family inet6 {
    address 2a00:12c0:101b:01f0::0254/64 {
        primary;
        preferred;
    }
}

Besides the 2a00 global address the interface also configures a link local address.

clb@srx01-av> show interfaces ge-0/0/4.802 terse 
Interface               Admin Link Proto    Local                 Remote
ge-0/0/4.802            up    up   inet     192.168.224.254/22
                                   inet6    2a00:12c0:101b:1f0::254/64
                                            fe80::5e45:2703:2209:e784/64

I configured the RAs to include the Prefix:

[edit protocols router-advertisement interface ge-0/0/4.802]
clb@srx01-av# show 
max-advertisement-interval 60;
min-advertisement-interval 20;
no-managed-configuration;
other-stateful-configuration;
prefix 2a00:12c0:101b:1f0::/64;

Unfortunately the router does send out RAs with the Link local source address and not the global address. This can be seen in a tcpdump from one of the hosts on the network:

host ~ # tcpdump -n -i eth0 icmp6
22:30:33.433466 IP6 fe80::5e45:2703:2209:e784 > ff02::1: ICMP6, router advertisement, length 56

Can I somehow configure the router to send the RAs with the "correct" address or am I getting a basic concept of IPv6 RA wrong?