BIRD export reject not working

[Marek Królikowski]

Hello guys,
I got strange problem with BGP i share data to Collector but i put to reject 
some bgp path....

This is how look configuration of BGP session of Collector:

protocol bgp Collector {
    description "Collector";
    local as MY-ASN;
    source address IPv61;
    neighbor IPV62 as SOMEONE-ASN;
    multihop;
    import none;
    export filter {
    if bgp_path.first = 64515 then reject;
    if bgp_path = 64515 then reject;
    if bgp_path.last = 64515 then reject;
    include "export.conf";
};
}

But:
root at pl-bgp:~# birdc6 show route export Collector all 2a0b:e206::/32
BIRD 1.6.3 ready.
2a0b:e206::/32     via 2a06:1287:330e:16::2 on bgp-fr [France 2017-09-18] * 
(100) [AS21430i]
        Type: BGP unicast univ
        BGP.origin: IGP
        BGP.as_path: MY-ASN 64515 20473 1299 21430
        BGP.next_hop: 2a07:XXXX.XXXX.XXXX
        BGP.local_pref: 100
        BGP.community: (64515,44)

Like You see in BGP path there is 64515.
How i export this to Collector if i put reject on export?
What is wrong?

I use BIRD 1.6.3.

Best Regards
Marek Krolikowski