LWT: Inserting Subset of columns returns all columns

CREATE TABLE IF NOT EXISTS test.inserttest(
    key bigint,
    session_token text,

    foo text, 
    bar text,
PRIMARY KEY(key, event_date, session_token);

INSERT INTO test.inserttest(key, session_token, foo) VALUES (1, 'myToken', 'baz') IF NOT EXISTS;

insert into test.inserttest(key, session_token, foo) VALUES (1, 'myToken', 'bez') IF NOT EXISTS;