Twisting vines create lighting glitches when bone mealed

Bone mealing twisting vines causes light to get darker starting at y=96 or 112. 

Reproduce

• Bone meal twisting vines up to y=96 or y=112
  Notice the twisting vines are dark
• Travel to the dark part of the twisting vines
  Notice it gets darker

Expected Result

It wouldn't change the light level