Yes. I consider it a bug in as much as Blizzard told us (somewhere – still to lazy to look) that Plans would continue to drop until we had them all. And since they don’t, they are not “working as intended”.
This is confirmed by Blizzard making it so the Blacksmith automatically learns Sage’s Journey when he hits Level 12.
This is not necessary. Blizzard’s QA Team reads every thread and post in this Bug Report Forum. And even though they don’t respond, anything they can reproduce or is reported enough is passed on to the Devs.
For more information on how this Bug Report Forum works, you can look this pinned thread over: