Bug with view definition?

Hello all,

why is the last definition of a view not working, although the
documentation says all three are equal?

Testcase:

CREATE SCHEMA one;
CREATE SCHEMA two;

CREATE TABLE one.one (
    id SERIAL PRIMARY KEY
);

CREATE TABLE two.two (
    id SERIAL PRIMARY KEY
);

CREATE TABLE join1 (
    id SERIAL PRIMARY KEY
);

CREATE OR REPLACE VIEW working AS
    SELECT one.*
    FROM one.one
    JOIN two.two ON TRUE
    JOIN join1 ON join1.id = one.id;

CREATE OR REPLACE VIEW also_working AS
    SELECT one.*
    FROM one.one
    CROSS JOIN two.two
    JOIN join1 ON join1.id = one.id;

CREATE OR REPLACE VIEW not_working AS
    SELECT one.*
    FROM one.one, two.two
    JOIN join1 ON join1.id = one.id;

Thanks in advance

Sebastian