Describe the bug
When you walk deep into building, the lower part of sky becomes black
Similar problem explained here #43

Screenshots

Desktop (please complete the following information):

• GPU NVidia
• Shader loader Iris

It happens almost in every building.
It would be perfect if you add a setting to adjust that effect.
Thank you for a great job!

It appears you are under an are where sky light is low. This effect's intention is to cover up the sky when chunks are not fully loaded in caves or the render distance in caves is not large enough to occlude the sky.

I understand that this effect tends to be very strong and have made the necessary changes in the latest beta build to reduce that effect.