How do I return all column values for the recently inserted row/rows?

I have these two tables in a PostgreSQL 12 database:

CREATE TABLE public.test (    entity_id uuid PRIMARY KEY DEFAULT uuid_generate_v4());CREATE TABLE public.test_registration (    entity_id uuid REFERENCES test(entity_id),    row_id uuid PRIMARY KEY DEFAULT uuid_generate_v4(),    entry_name text,    code text);

entry_name is populated by a trigger AFTER INSERT:

CREATE OR REPLACE FUNCTION test_registration_entry_name()  RETURNS trigger AS$$BEGIN   UPDATE test_registration   SET entry_name = new_inserts.code   FROM new_inserts   WHERE new_inserts.row_id = test_registration.row_id;   RETURN NULL;END$$ LANGUAGE plpgsql;CREATE TRIGGER test_insert_triggerAFTER INSERT ON test_registrationREFERENCING NEW TABLE AS new_insertsFOR EACH STATEMENTWHEN (pg_trigger_depth() = 0)EXECUTE PROCEDURE test_registration_entry_name();

The trigger function differs from table to table.

My current issue is when I insert a row into test_registration as such:

INSERT INTO test DEFAULT VALUESRETURNING entity_id;  -- let's say: 'a17e66c5-1049-4ba9-bed3-90bbc823e064'

And then insert a registration and return all row values for the inserted row:

INSERT INTO test_registration (entity_id,code)VALUES ('a17e66c5-1049-4ba9-bed3-90bbc823e064'::uuid,'EB')RETURNING *

I get all column values correctly, except for the entry_name which is null. Which makes sense because entry_name is being set after the insert.

So I tried to expose this by altering my INSERT using the row_id as such:

WITH create_query AS (INSERT INTO test_registration (entity_id,code)VALUES ('a17e66c5-1049-4ba9-bed3-90bbc823e064'::uuid,'13')RETURNING *) SELECT v.entity_id, v.row_id, b.entity_id,b.entry_name, b.row_id from create_query AS v, test_registration AS b WHERE V.Row_id = b.Row_id

This then turns out to not return anything. create_query.row_id seems to differ from the one in test_registration - which makes no sense? Why would they be different?

How can I extract all column values for the inserted row, after the triggers has been triggered.