Thunder effect not affected by weather volume setting

The thunder (lightning) sound effect is not adjusted with the weather slider.

 

Steps to reproduce

1. Set Master Volume Volume Slider and Weather Slider to 100%
2. /weather thunder
3. Wait for Lightning to strike; observe sound level (or self-induce it with /summon lightning_bolt ~ ~ ~)
4. Set Weather Slider to 1%
5. Wait for Lightning to strike; observe sound level
6. Set Weather Slider to OFF
7. Wait for Lighting to strike; observe that the lightning is not creating thunder sounds

What I expect to happen

At step 4, I expect Thunder to be nearly silent