When invoking EntityManager.refresh(Object), the specified entity does not get refreshed wrt. the current database state.

Setup for reproduction of this bug:

1. Load an already existent entity via the entity manager
2. Directly (not using the entity manager) change the row in the database table that corresponds to the in step 1 loaded entity.
3. Call EntityManager.refresh on the in step 1 loaded entity
4. The entity does not get refreshed with the value that has been set in step 2