The intention was to allow players to spirit walk back to their bodies in Pandaria. If there are problems with specific locations or graveyards that's not allowing you to do that, let us know.
I can forward that information to the developers for further review.
Quest: Nana's Vote II: The Sacred Springs
If you aggro the guardian while trying to collect the 1000 Year water and die, there is NO way back up to your body. You're put down at a graveyard near Halfhill. Convenient, eh? :p
There is a spire near the Widow's Wall close to the Arboretum in the Jade Forest. If you fly over, or too close to that spire, you will be forcibly dismounted and dropped to your death. If you're unlucky enough to land on an outcropping of that cliff, you're screwed. The graveyard you're put at is over on Windward Isle or thereabouts.
I'm as patient as they come when it comes to glitches and bugs, because you can almost always rely on the community to find a quick fix or workaround until bugs are squashed, but there is literally nothing you can do in these cases except take a 10 minute debuff, or beg someone to come rez you if they even can.
As mentioned, fighting Major Nanners, so I won't rehash that.
At the very -least-, make it so if you die in these particular areas, you'll auto-rez somewhere without penalty. I'm not even sure I understand why the spectral mounts are so undesirable. If it's to keep lowbies out of level 90 areas... hello, 2 person flying mounts. They can already get anywhere they desire if they can get to Pandaria.