"Should_darken_sky" feature of "minecraft:boss" component doesn't work if put in addons on entities

The option "should_darken_sky" of "minecraft:boss" component don't works to entities in addons through is in true, if i put an entity file and i put in it the said component with "should_darken_sky" in true and i create a world with this addon and i put this entity on the world, this function don't works

The attached pack is a behavior pack that adds boss features to the warden, adds a hud bossbar and it should darken the sky in its presence, but it doesn't. 

Steps to reproduce:

1. Create a world with this pack

2. Put the warden in your world

Expected results:

The warden does show the bossbar and in its presence, the sky should be darken like wither 

Obtained results:

The warden does show the bossbar, but in its presence, it don't shows the darken sky as is logged in its file