The Bug Experience Orbs within spawners are 2D which is inconsistent with other entities in spawners which are all 3D. This causes them to be small and un-viewable at certain times during there rotations.
intentional: if you summon a experience orb with commands or somehow managed to get something to drop the experience orb, it will face you wherever you face it which means it is 2D
Hi there!
I can confirm for snapshot 20w30a and release 1.16.1.