Summary:

Light particles are not affected by the darkness effect. Light particles such as enderman particles and magma cubes are not affected by the darkness effect.

Steps to reproduce:

1. Set the night.
2. Give yourself the effect of darkness (/effect @s darkness 1000000 100 true).
3. Summon Enderman / Magma Cube.
4. Move away from them.
5. Look at the particles.

Observed results:

Light particles are not affected by the darkness effect.

Expected results:

Light particles will be affected by the darkness effect.