falling_block Lighting Inconsistency with Smooth Lighting on

Inconsistent lighting on falling_block entities vs blocks. Lighting glitch specific to falling blocks.

Falling Block command I used

summon falling_block ~ ~3.5 ~ {BlockState:{Name:"minecraft:quartz_block"},NoGravity:true,Tags:["FallingSandX"],Time:-2147483648}

Seems to darken falling_block left of solid blocks. Not certain positive/negative coordinates affect this.

See screenshots. Shaded blocks are the entities.