It is not affecting production, but it is impeding our attempt to upgrade from 4.2.x to 4.3.x. We have other smaller issues encountered with 4.2.x, which we want to verify with 4.3.x (to see if those issues are already fixed), before we file additional tickets.
Just to be clear, we want sessionIdEnabled to be set to "true" for our deployments.
Best regards.