Emissives work only if built in pack is also loaded

[VindSole]

I was trying to make emissives for my textures, but the overlays only appear when also loading the "Glowtone Emissive Textures" pack, that may be inconvenient if intended because I'd have to overwrite all emissives included by the mod.

Steps To Reproduce

1. Load custom made resource pack with glowtone emissives without the glowtone built in pack.
2. Load the built-in resource pack to make the above pack emissive

Expected Behavior

The mod should detect textures with the "glowtone_emissive" suffix on user resource packs without loading the built in resource pack.

Screenshots
Built in pack not loaded

Built in pack loaded

Logs
https://gist.github.com/VindSole/e8a54a27b1de0b1c4a10041df4b3917a

Additional context
Nothing to add.