XP Orbs become very dark when viewing them from above

XP orbs become very dark when viewing them from above.

Additionally they become extra dark when the player is facing east/west

Reproduction Steps:
- Throw a bunch of xp bottles
- Stay above them while looking straight down
- (Optionally) Rotate your camera so your facing is either 90/0 or -90/0

Observred Results:
- The XP orbs become very dark

Expected Results:
- The XP orbs would stay the same brightness