I can't explain this behaviour...

#!/usr/bin/perl

use Net::DNS;
#use IO::Socket::IP;

$testcandidate="cl";


print "IPV4 test...\n";
      $res = new Net::DNS::Resolver;
      $res->tcp_timeout (1) ;
      $res->retry (1) ;
      $res->retrans (1) ;
      $query = $res->nameservers('162.219.53.120');
      $query = $res->query($testcandidate, "SOA");
      print "What's in the array: \n";
      print join ' ', $res->nameservers();
      print "\n";
      my $serial=($query->answer)[0]->serial, if ($query);
      print "serial:  $serial\n";

print "\n\nIPV6 test...\n";
      $res = new Net::DNS::Resolver;
      $res->tcp_timeout (1) ;
      $res->retry (1) ;
      $res->retrans (1) ;
      $query = $res->nameservers('2620:10a:80d1:1053::120');
      $query = $res->query($testcandidate, "SOA");
      print "What's in the array: \n";
      print join ' ', $res->nameservers();
      print "\n";
      my $serial=($query->answer)[0]->serial, if ($query);
      print "serial:  $serial\n";
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Which outputs...

[root@ns01 jzack]# ./snippet 
IPV4 test...
What's in the array: 
162.219.53.120
serial:  2020070925


IPV6 test...
What's in the array: 

serial:
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How is it that the IPv6 address isn't even being mentioned when I print the array elements? I thought I was debugging a Net::DNS issue...but it seems I must be doing something wrong with arrays in general? When I throw this into debug, I see: IPV6 test... ;; query(cl, SOA) ;; setting up an AF_INET() family type UDP socket So how do I get it to not use AF_INET?