DrawSizePreservingFillContainer not behaving as expected when parent is padded (ppy/osu-framework issue #3592)

NoteContainer.cs

using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Shapes;
using osuTK;
using osuTK.Graphics;

namespace ProjectDiba.Game.Graphics.RhythmGame
{
    public class NoteContainer : CompositeDrawable
    {
        public NoteContainer()
        {
            Padding = new MarginPadding
            {
                Top        = 96,
                Bottom     = 192,
                Horizontal = 32,
            };
            InternalChildren = new Drawable[]
            {
                new Box
                {
                    RelativeSizeAxes = Axes.Both,
                    Colour = Color4.Red,
                },
                new DrawSizePreservingFillContainer()
                {
                    RelativeSizeAxes = Axes.Both,
                    Width = 1, Height = 1,
                    TargetDrawSize   = new Vector2(3600, 1600),
                    Child = new Box
                    {
                        Width = 3600,
                        Height = 1600,
                        Colour = Color4.Blue,
                        Alpha = 0.2f,
                    }
                }
            };
        }
    }
}