Has Nameserver reference in Zone creation changed?

We have an old BIG-IP 11.6.1 GTM where we have a nameserver in partition Common2, and being referenced by a Zone that's in the Common partition.

I tried doing the same thing in our newer BIG-IP (15.0.1) GTM but realized it's not populating the nameserver list with any nameserver from the Common2 partition. 

Is this a change in functionality or did I miss a configuration point somewhere?

Thanks for any help!