pgsql bug?

DROP TABLE IF EXISTS  test CASCADE;  
DROP FUNCTION IF EXISTS test2;

CREATE TABLE test (
	a   INTEGER NOT NULL,
	b   INTEGER NOT NULL
);


CREATE OR REPLACE FUNCTION test2() RETURNS TRIGGER AS $$
BEGIN
	PERFORM test3(new);
END $$ LANGUAGE plpgsql;

CREATE TRIGGER test AFTER INSERT OR UPDATE 
ON test FOR EACH ROW
EXECUTE PROCEDURE test2();


CREATE OR REPLACE FUNCTION test3(IN src test) RETURNS VOID AS $$
BEGIN
	RAISE EXCEPTION 'expected c to be 1: %',src.c;
END $$ LANGUAGE plpgsql;

ALTER TABLE test ADD COLUMN c INTEGER NOT NULL;

-- insert in same session yields 

-- testdb=# INSERT INTO test (a,b,c) VALUES (1,1,1);
-- ERROR:  record "src" has no field "c"
INSERT INTO test (a,b,c) VALUES (1,1,1);

-- after reconnect to db

INSERT INTO test (a,b,c) VALUES (2,2,2);

-- testdb=# INSERT INTO test (a,b,c) VALUES (1,1,1);
-- ERROR:  expected c to be 1: 2