When a font asset is unloaded the font’s textures are not destroyed and still consume VRAM

[Kulodo]

When a font asset is unloaded the font’s textures are not destroyed and still consume VRAM.
Is there a reason for that or is it a bug?

The font class does not have a destroy method so asset.unload cannot call it.

I attempted a work around in the test project https://playcanvas.com/project/1264902/overview/unloading-a-font-asset.
In this project the user can press the space bar to toggle between a large VRAM font and a small VRAM font.
To show the bug, comment out the workaround in this function.

Test.prototype.unloadFontAsset = function(fontAsset)  {
    // When unloading a font asset the font's texture(s) are not destroyed.
    // which is a waste of VRAM.
    let textures = fontAsset.resource.textures;
    for (let i = 0; i < textures.length; i++) {
        let texture = textures[i];

        // Destroy to free resources associated with this texture.
        // see https://api.playcanvas.com/classes/Engine.Texture.html#destroy
        texture.destroy();

        // Clear the font texture from the resource loader cache.
        // see https://api.playcanvas.com/classes/Engine.ResourceLoader.html#clearCache
        this.app.loader.clearCache(texture.name,'texture');
    }
    fontAsset.unload();
};