Executing query in HQL editor or Hibernate Criteria editor produces exception

To reproduce:

• create project
• create cfg.xml and console configuration (use the sakila database)
• reverse engineer from sakila
• open hql editor and execute 'select o.filmActors from Actor o'
• resulting error: 'java.lang.IllegalArgumentException: Not an entity [class java.lang.String]'

It seems to happen in an inconsistent way:

• only the first two time?
• only when using hibernate 5.3?