event.get returns empty response since 4.2 -> 4.4 upgrade

my $events = $self->{'api'}->do('event.get', {
    'selectTags'          => "extend",
    'selectRelatedObject' => "extend",
    'selectHosts'         => "extend",
    'select_acknowledges' => "extend",
    'tags'                => [ { "tag" => "Ticket", "value" => "Y", "operator" => 1 } ],
    'source'              => 0,
    'value'               => 1,
});