Spell_effects component doesn't add effect

Release_566145

Summary:
When applying the spell_effects component, the entity doesn't receive the defined effect

Impact:
This is a pivotal feature of one of our enemies in an upcoming survival adventure map. One of the main enemies that show up throughout the map use this as a way of buffing other enemies.

Retro Steps:

1. Add included json to any behavior pack
2. Spawn zombie and light it on fire

Observed Results:
Zombie dies on first fire tick (zombie's health is set to 1)

Expected Results:
Zombie lives in the fire until the duration of 100 seconds elapses

Screenshots/videos attatched:
Example usage taken from included json file

            "minecraft:spell_effects":{  
               "add_effects":{  
                  "effect":"fire_resistance",
                  "duration":100
               }
            }

Other Notes:
It isn't clear how to use duration, ambient, amplifier, and visible in the effect string. Duration works as a separate parameter, but Visible doesn't seem to.