print Dumper $parse->section ('
    bind-server 127.0.0.1
    tsig-key "/etc/bind/rndc.key"
');
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You're asking it to parse a section. You probably want to parse a config.

print Dumper $parse->config ('
    bind-server 127.0.0.1
    tsig-key "/etc/bind/rndc.key"
');
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