Sequential scan with composite type in primary key

Hello,

With this schema:
  CREATE TYPE item AS (
    name text,
    date date
  );
  CREATE TABLE item_comment (
    item item,
    user_id text,
    comment text,
    CONSTRAINT item_comment_pk PRIMARY KEY (item, user_id)
  );

And this query:
  EXPLAIN SELECT * FROM item_comment WHERE item = ('', '2019-07-24');
  -- OK: Bitmap Index Scan
Postgresql uses the primary key index.

But with this query:
EXPLAIN SELECT * FROM item_comment WHERE (item).name = '';
-- KO: Seq Scan
Postgresql does a full table scan.

Should I inline the composite type ?
  CREATE TABLE item_comment (
    name text,
    date date,
    user_id text,
    comment text,
    CONSTRAINT item_comment_pk PRIMARY KEY (name, date, user_id)
  );
Or is there a better way (without creating another index) ?

Thanks.