Not unsubscribing can cause errors in the code?

[samedhi]

More than just memory leaks, failing to unsubscribe can actually effect other listeners. Try removing the unsubscribe from the check-for-reference-in-metadata and observe that it will cause later listener's (like those in hydrator) to fail.

Failing to unsubscribe should be a memory leak, but I don't feel that it should cause actual changes in result sets.