Bug: dblink_send_query not work on 9.2?

I have problem with dblink_send_query function on Postgres 9.2.2

This work

do $$
begin
perform dblink.dblink_connect('internal');
perform dblink.dblink_exec('internal', 'set application_name=''dblink'';',
true);
perform dblink.dblink_disconnect();
end;
$$

But this not

do $$
begin
perform dblink.dblink_connect('internal');
perform dblink.dblink_send_query('internal', 'select dummy();');
perform dblink.dblink_disconnect();
end;
$$

I got error

ERROR: connection "internal" not available
SQL state: 08003
Context: SQL statement "SELECT dblink.dblink_send_query('internal', 'select
dummy();')"
PL/pgSQL function inline_code_block line 5 at PERFORM

It's works without problems on version 9.0

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