SYSFS match key has disappeared
The SYSFS match key has been replaced with the ATTR key. When the box rebooted, the first two lines no longer worked so the rule generator kicked in and wrote the new rules starting with the first available interface number.
But I can't find exactly when SYSFS was dropped. Just various bits and pieces hinting that SYSFS had been deprecated, documentation with just one word changed, etc.
