BUG?: Code Editor – Completion Insight - Autogenerate GROUP BY clause

Question

With the “Autogenerate GROUP BY clause” enabled the following problem occurs:
Coding an inline select in an aggregate query:
  SELECT   (SELECT   DEPARTMENT_NAME
              FROM   departments d
             WHERE   d.department_id = e.department_id) dep
        , JOB_ID
        , SUM (salary)
    FROM   employees e
GROUP BY   department_id, job_idCode group-by-autogenerate transforms this from time to time into:
  SELECT   (SELECT   DEPARTMENT_NAME
              FROM   departments d
             WHERE   d.department_id = e.department_id) dep
             , JOB_ID
             , SUM (salary)
    FROM   employees e
    GROUP BY (SELECT   DEPARTMENT_NAME
              FROM   departments d
             WHERE   d.department_id = e.department_id), JOB_IDWhich results in:
ORA-22818. 00000 - "subquery expressions not allowed here"
*Cause:    An attempt was made to use a subquery expression where these
are not supported.
*Action:   Rewrite the statement without the subquery expression.
when trying to run it.
(version 2.1.0.6.3; build MAIN-63.73; Windows XP)

Answer 1

Duplicate of
2.1 EA1 - Auto Group By inserted when unwanted/expected