JPQL "select t, new de.m3y3r.hhh.TestObject(t, 'tags') from TestEntity e join e.tags t group by t" gives "unexpected token: t near line 1, column 8".

This JPQL query works in EclipseLink and seems to be okay according to this documentation:
https://docs.oracle.com/cd/E12839_01/apirefs.1111/e13946/ejb3_langref.html

Bug or feature?