The bug is related to testing ODL with QBGP in VPNv6 mode.
While the feature is ok for IPv6 host machines, the problem arises when wanting to inject prefixes.

This is easily reproducible by using following command:

bgp-network --label 62655 --prefix 83::434/128 --rd 503:1 --nexthop 3.4.4.4 --afi 2 add

note: afi parameter is useless.

the prefix 83::434/128 is checked against IPv6 matching.
Because the prefix length /128 is not ignored, there is an issue.

the fix consists in stripping /128 part and analysing only IPv6 part.