issue with vision and potion effects in powder snow

When in powdered snow with blindness effect vision is cleared in powdered snow

What I expected to happen was...:
i was trying to see if it would be possible to make minecraft horror maps just a little scarier 

What actually happened was...:
what actually happened was that blindness effect cleared up my vision in powdered snow

Steps to Reproduce:
1.make a 3x3x3 cube of powdered snow
2. effect self with blindness
3. go into the 3x3x3 block of powdered snow