Not a bug. So wrong usage. 
while ( $sth->{Active} and
        $rowcache=$sth->fetchall_arrayref({}, $max_rows)
) {
    ...
}

[download]
See the DBI documentation: the last possible fetch in a fetchall will call $sth->finish.

In reply to Re^2: fetchall_arrayref with slice and row count by druud
in thread fetchall_arrayref with slice and row count by gmax

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