Working on Archaeology stuff and found that two of my “nodes” (Pandaria Archaeology Find) to pick up in Winter’s Blossom, Kun-Lai Summit, Pandaria are impossible to pick up because they seem to spawn either below the ground or hidden within an object in the area. The nodes despawned without me being able to pick them up.
I don’t work with coordinates so I can’t give an exact location but it is by one of the large "keg depencers that’s near the main path in the area (below the flight path), close to where it spits into two other paths before one of those paths goes through the gate to Townlong Steppes.