ERROR: structure of query does not match function result type

snippet.sql

create or replace function similarity(my_user_id int)
returns table(user_id int, similarity float) as $$
  begin
    return query select similarity(my_user_id, 'default=>1'::hstore);
  end;
$$ language plpgsql stable strict;
  
create or replace function similarity(my_user_id int, weightings hstore)
returns table(user_id int, similarity float) as $$
  begin
  -- stuff that works
  end
$$ language plpgsql stable strict;