RF02 triggered when passing a table as an argument to a function

L:  16 | P:  28 | RF02 | Unqualified reference 'mytable' found in select with
                       | more than one referenced table/view.
                       | [references.qualification]

CREATE TABLE mytable (
    a int,
    b int
);

CREATE TABLE othertable (
    c int
);

CREATE FUNCTION myadd(mytable)
RETURNS NUMERIC AS $$
  SELECT $1.a + $1.b;
$$ IMMUTABLE LANGUAGE sql;

CREATE VIEW myview AS
SELECT othertable.c, myadd(mytable) FROM mytable, othertable;

[sqlfluff]

dialect = postgres
templater = raw

max_line_length = 120

processes = -1

[sqlfluff:rules:capitalisation.keywords]
capitalisation_policy = upper