A bad Hibernate day for us today, we hit this one again this afternoon on another project.

The previous workaround doesn't really work. We got it working with:

fullTextQuery.initializeObjectsWith(ObjectLookupMethod.SECOND_LEVEL_CACHE,
DatabaseRetrievalMethod.FIND_BY_ID)

(FIND_BY_ID instead of QUERY)

Does anyone have any pointer on where the problem could be before I start digging?

I see this one as a very critical bug as Search doesn't return the results it should return.