ClassNotFountException When loading custom component inside SceneBuilder

[Wip-Sama]

I want to load a component inside scenebuilder but when I go to add the jar every fxml that has a FontIcon inside is not loaded.

If I remove the FontIcon from this fxml the component is loaded correctly.

ikonli core/javafx/fluentui are installed on both the project and scenebuilder, if I open the fxml it works but does not when i try to load it as a component.
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