I recently level from 1-12 on Herod PVP horde. Xfer to whitemane and all the quests i completed in Trisfal and what was done in Silverpine are now available again. Interestingly for example quest 1 in a chain is available even though I am now at the same time completing quest 4 in the chain. I contacted blizzard and they said nothing is wrong. to submit bug.
Also my entire map of Silver/Tris is undiscovered, which isnt the end of the world, just annoying. Theoretically all of this is just annoying but ill level out of here in a few days so its not the end of world.