BGP session closed after receipt of flowspec route without destination prefix

[Alex D.]

Hi,

i configured the following flowspec route on a Juniper router:
route v6test {
     match {
         source 2a02:xxxx:xxxx:xxxx::1/128;
     }
     then discard;
}

The route was accepted on my Juniper router and blocked all traffic from
src ip 2a02:xxxx:xxxx:xxxx::1 as expected. After advertising the route,
BIRD closed the BGP session. Is this an expected behaviour, means does
is it necessary, that a dst prefix for a flowspec route must exist ?

Log:
2020-01-24 09:52:26.750 <RMT> vs_dis_r1_6838: No dst prefix at first pos
2020-01-24 09:52:26.750 <RMT> vs_dis_r1_6838: Error: Malformed attribute
list
2020-01-24 09:52:26.750 <TRACE> vs_dis_r1_6838: BGP session closed

BIRD accepted the route after changing to:
route v6test {
     match {
         destination ::/0;
         source 2a02:xxxx:xxxx:xxxx::1/128;
     }
     then discard;
}

Regards,
Alex
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