I am referring to this situation https://gist.github.com/anonymous/6435032
The following problem occur:
When using HardCover as the root entity of a query, the ObjectHydrator fails to properly register the first [HardCover of the resultset]'s Book. Only the first. The following HardCover have their Books correctly linked. The inverse situation (using Book as the root entity) works fine.
When some other entity (say WoodenPart) is linked to HardCover via a ManyToOne association, using WoodenPart as a query root results in no WoodenPart have their HardCover registered.