Net::DNS::ZoneFile::Fast::parse returns bad data after reading zone text containing $INCLUDE

If I run Net::DNS::ZoneFile::Fast::parse with zone text containing a $INCLUDE directive, the second zone I try to parse returns only the included records.

Test script:

 use Net::DNS::ZoneFile::Fast;
 use Data::Dumper;

 open ZONE, 'something.com' or die;
 $txt.=$_ while(<ZONE>);
 close ZONE;

 $r1=Net::DNS::ZoneFile::Fast::parse($txt);
 print Dumper($r1);

 open ZONE, 'whatever.com' or die;
 $moink.=$_ while(<ZONE>);
 close ZONE;

 $r2=Net::DNS::ZoneFile::Fast::parse($moink);
 print Dumper($r2);

Contents of 'something.com':

$TTL 1H

@ IN SOA ns0.something.com. hostmaster.something.com. (
                        2012112601 ; serial number YYYYMMDDNN
                        30m ; refresh
                        10m ; retry
                        1d ; expire
                        10m ) ; negative TTL

; Name servers
                NS ns0.something.com.
                NS ns1.something.com.

$INCLUDE "include-file"

Contents of 'whatever.com':

$TTL 1h

@ SOA ns0.whatever.com. hostmaster.whatever.com. (
                2010112201 ; Serial
                30m ; Refresh
                10m ; Retry
                10d ; Expire
                30m ; Negative TTL
                )

; Name servers
                NS ns0.whatever.com.
                NS ns1.whatever.com.

Contents of 'include-file':

wibble IN A 1.2.3.4

The second Dumper() output looks like

$VAR1 = [
          bless( {
                   'ttl' => 0,
                   'name' => 'wibble',
                   'rdata' => '
[binary data]',
                   'rdlength' => 4,
                   'Lines' => 1,
                   'Line' => 1,
                   'type' => 'A',
                   'class' => 'IN',
                   'address' => '1.2.3.4'
                 }, 'Net::DNS::RR::A' )
        ];

If I comment out the single entry in 'include-file', I get nothing at all:

$VAR1 = [];

but if I comment out the $INCLUDE directive, the results are correct:

$VAR1 = [
          bless( {
                   'minimum' => 1800,
                   'serial' => 2010112201,
                   'ttl' => 3600,
                   'mname' => 'ns0.whatever.com',
                   'name' => '',
                   'rdata' => '[binary data],
                   'retry' => 600,
                   'refresh' => 1800,
                   'rdlength' => 51,
                   'Lines' => 7,
                   'Line' => 3,
                   'type' => 'SOA',
                   'class' => 'IN',
                   'expire' => 864000,
                   'rname' => 'hostmaster.whatever.com'
                 }, 'Net::DNS::RR::SOA' ),
          bless( {
                   'nsdname' => 'ns0.whatever.com',
                   'ttl' => 3600,
                   'name' => '',
                   'rdata' => '[binary data]',
                   'rdlength' => 18,
                   'Lines' => 1,
                   'Line' => 12,
                   'type' => 'NS',
                   'class' => 'IN'
                 }, 'Net::DNS::RR::NS' ),
          bless( {
                   'nsdname' => 'ns1.whatever.com',
                   'ttl' => 3600,
                   'name' => '',
                   'rdata' => '[binary data]',
                   'rdlength' => 18,
                   'Lines' => 1,
                   'Line' => 13,
                   'type' => 'NS',
                   'class' => 'IN'
                 }, 'Net::DNS::RR::NS' )
        ];

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: dnssec-tools 1.13-1
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Mon Nov 26 10:01:46 2012
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-05-04 (205 days ago)
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: dnssec-tools
UpgradeStatus: Upgraded to quantal on 2012-11-01 (24 days ago)