Shadows do not render behind experience orbs

The bug

Has been affecting the snapshots for a while now. Pretty hard to notice though.

How to reproduce

1. /gamemode spectator
2. /summon minecraft:experience_orb
3. Look closely at it
   → Shadow does not render behind the experience orb

Note that the translucency of experience orbs is an intentional feature and should be kept - see MC-163034.