Reloading asset called twice when asset changed.

[nahaharo]

Like in a image, when I change the single asset file, the asset server triggers reloading twice.

This makes modified event for this asset triggering twice.

What is happening?

below is a my custom loader.

#[derive(Asset, TypePath, Deref, DerefMut)]
struct KotoScriptFile(String);

#[derive(Default)]
struct KotoScriptFileLoader;

#[non_exhaustive]
#[derive(Debug, Error)]
enum KotoScriptFileLoaderError {
    /// An [IO](std::io) Error
    #[error("Could not load asset: {0}")]
    Io(#[from] std::io::Error),
}

impl AssetLoader for KotoScriptFileLoader {
    type Asset = KotoScriptFile;
    type Settings = ();
    type Error = KotoScriptFileLoaderError;
    async fn load(
        &self,
        reader: &mut dyn Reader,
        _settings: &(),
        _load_context: &mut LoadContext<'_>,
    ) -> Result<Self::Asset, Self::Error> {
        let mut script = String::new();
        reader.read_to_string(&mut script).await?;
        Ok(KotoScriptFile(script))
    }

    fn extensions(&self) -> &[&str] {
        &["koto"]
    }
}