This issue could exist since a long time. Having only 3 servers, each nameserver, did hide the problem (as each could resolve)
In my numerous tests, I made a virtual machine using an old Ubuntu server 15.04 and the problem was present. But,in the meanwhile, my bind server was having troubles (rx/tx activated). So I don't know if its due to 15.04 or the production bind server
I'll try to test on the upstream build as soon as possible. I'll tell you
This issue could exist since a long time. Having only 3 servers, each nameserver, did hide the problem (as each could resolve)
In my numerous tests, I made a virtual machine using an old Ubuntu server 15.04 and the problem was present. But,in the meanwhile, my bind server was having troubles (rx/tx activated). So I don't know if its due to 15.04 or the production bind server
I'll try to test on the upstream build as soon as possible. I'll tell you