When "hibernate.order_inserts = true" and there is an entity been inserted with uninitialized associations it can result in a LazyInitializationException. As I could debug it happens in ActionQueue.findBatchNumber when it tries to find the batch number for an association resulting in a call to the entity hashCode method.
Maybe you could check if the association is initialized before trying to compute its batch number.
I'm 99% sure this area was reworked for similar issues, but the specific tickets escape me. Feel free to attach a test case if it's still an issue