Either can work.Do I need to manually add this or should I stay on 6.5.11-2 and wait for update?
Interface renaming is a once-on-boot thing, so if it's currently working for you, it will stay that way, well at least until the next reboot.
If you add those lines manually you'd hedge against needing to reboot earlier than an update is ready.
That said, I'll re-check this now a bit more closely and can also test it better for this regression, so there probably will be an update soon – but just to manage expectations: this is the test repo, it is the weekend, and I cannot promise any fixed timeline, as always.