I am not sure whether this is a bug or not. but exp orbs are not rendered in 3d. I don't see any reason why not so that's why im reporting
what I expected to see was: 3d orbs, because all blocks/items are now rendered in 3d.
what I actually saw was: 2d exp orbs
Would be a good idea if mojang decide to remplace the exp orbs for exp blocks, for example: green 3D mini-blocks. Actual orbs are in 2D intentionality, sorry.