Memory leaks when using insert function, even with destroy.

I wrote a laravel command to operate many images, something like that:

while (true) { // use while-true to simulate lots of images
    foreach (Storage::files('tmp') as $file) {
        echo $file, "\n";
        $image = Image::make(storage_path('app/' . $file));
        // $img = Image::make(storage_path('app/' . $file));
        $img = clone($image);
        $img->crop(200, 100);
        // $this->some($img);
        $image->insert($img);
        $image->save(storage_path('tmp.png')); // without this save, grows much slower. It is another encode leaks issue I think.
        $img->destroy(); // without these two destroy, script booms very quickly.
        $image->destroy();
        usleep(25);
    }
}

The memory usage grows about 1M per second on my PC.

By the way, I am using GD2 driver on Windows. Maybe it's an issue of GD? I will try it on Linux later.

Anyidea?

Reproduce the memory growth from the command example while varying insert(), save(), and destroy() calls with the GD2 driver. Compare behavior on the reported Windows environment and Linux if available; done means identifying whether the leak is in this library's image operations or GD2 and documenting a confirmed fix or limitation.