Smooth lighting transition from level 1 to 0 is not smooth

This is a repost of MC-197497 for Bedrock Minecraft.

Light levels changing from 1 to 0 are not smooth when smooth lighting is enabled, leaving a jagged difference between blocks with and without light regardless of the setting.

Steps to Reproduce

       1. In creative mode, fly away from the terrain below you

       2. Run the following commands in order:

/fill ~2.5 ~2.5 ~2.5 ~-2.5 ~-2.5 ~-14.5 hardened_clay

/fill ~1.5 ~1.5 ~1.5 ~-1.5 ~-1.5 ~-13.5 air

/fill ~ ~-2 ~2 ~1 ~-2 ~2 torch

       3. Navigate to the end of the corridor

Here, the light from the torches will abruptly cut off.