Description:

You can not specify the color of "ambient_entity_effect", "effect" and "entity_effect", unlike with "block" where you can specify the type of block you want after the "block" or with "dust" and "falling_dust" where you can make a sort of RGB mix after the "dust" or "falling_dust".

How to reproduce:

1. Open a world.
2. Do /particle minecraft:effect(or one that I mentioned above)
3. Notice after that you MUST put in the coordinate, hence cannot modify the color of the effect.