I'm not sure about the earlier versions listed as affected versions, but I've confirmed that this HQL:

select p.id, size( descendants ) from Animal p left outer join p.offspring descendants group by p.id

fails due to HHH-10024 Closed with this commit:
https://github.com/hibernate/hibernate-orm/commit/1873ffa9a49282435dcf4ae0635a6c08864e6284