Adding New Ad Astra Solar System

Can't seem to get it to let me add a solar system.
Here is the wiki, it should be pretty straight forward to add one according to this (also adding this because probably anyone trying to help isn't familiar with ad astra) -> https://github.com/terrarium-earth/Ad-Astra/wiki/Solar-Systems
In my resourcepack I have in assets/darkstar/planet_resources/solar_systems/dark_star.json
  "galaxy": "ad_astra:milky_way",
  "solar_system": "darkstar:dark_star",
  "sun": "darkstar:textures/sky/gui/dark_sun.png",
  "sun_scale": 25,
  "button_color": "black",
  "ring_color": {
    "r": 36,
    "g": 50,
    "b": 123,
    "a": 200
  }
}```
The sun texture is referencing a valid png in ``assets/darkstar/textures/sky/gui/dark_sun.png``

When I couldn't get this to work, I tried doing a test solar system that was just a copy of one of the default solar systems, 
``assets/darkstar/planet_resources/solar_systems/test.json``
```{
    "galaxy": "ad_astra:milky_way",
    "solar_system": "darkstar:test",
    "sun": "ad_astra:textures/sky/gui/blue_sun.png",
    "sun_scale": 18,
    "button_color": "turquoise",
    "ring_color": {
      "r": 0,
      "g": 128,
      "b": 128,
      "a": 200
    }
  }```
This one doesn't work either.