Expected Behavior

When killing a mob, xp orbs that drop should be green.

Actual Behavior

When mob is killed, the xp orbs that drop are transparent grayish color / invisible.

Reproduction Steps

Killing a mob will reproduce said issue.

• Java Version: 1.8.0_51 x64
• CPU: i7 4790k
• GPU: GTX 1080Ti

Can you give a screensot???
Minecraft 1.15 changed how xp orbs look so this may be vanilla behaviour.

Can you give a screensot???

It only happens with smooth lighting set to high, here's a GIF showing the difference between low and high.

Indeed it happens, with Smooth Lighting at a minimum it looks smooth but at maximum the experience orbs look transparent.
Smooth Lighting minimum:

Smooth Lighting maximun:

Smooth Lighting off:

Possibly related to #68.