[OpenFL 8.9.6, Lime 7.7.0, HTML5] Drawing Sprite to BitmapData, that has TextField mask - doesn't work

Help
#1 
        var s:Sprite = new Sprite();

		var tFormat:TextFormat = new TextFormat(null, 124);

		var dropShadow:DropShadowFilter = new DropShadowFilter(4, 90, 0x4e1321, 1, 8, 8, 4);

		var dropShadowTField:TextField = new TextField();
		dropShadowTField.defaultTextFormat = tFormat;
		dropShadowTField.textColor = 0xffffff;
		dropShadowTField.text = "TEST";
		dropShadowTField.width = 300;
		dropShadowTField.height = 200;
		s.addChild(dropShadowTField);
		dropShadowTField.filters = [dropShadow];

		var tField:TextField = new TextField();
		tField.defaultTextFormat = tFormat;
		tField.textColor = 0xffffff;
		tField.text = "TEST";
		tField.width = 300;
		tField.height = 200;
		s.addChild(tField);

		var gradient:Shape = new Shape();
		var colors:Array<UInt> = [0xffffff, 0xfcffab, 0xffdb91];
		var alphas:Array<Float> = [1.0, 1.0,1.0];
		var ratios:Array<Int> = [0x33, 0x99, 0xcc];
		var mat:Matrix = new Matrix();
		mat.createGradientBox(300, 200, -Math.PI / 2, 0, 0);
		gradient.graphics.beginGradientFill("linear", colors, alphas, ratios, mat);
		gradient.graphics.drawRect(0, 0, 300, 200);
		gradient.graphics.endFill();
		s.addChild(gradient);

		gradient.cacheAsBitmap = true;
		tField.cacheAsBitmap = true;
		gradient.mask = tField;

		addChild(s);

		var bd:BitmapData = new BitmapData(Math.ceil(tField.width), Math.ceil(tField.height), true, 0);
		bd.draw(s);

		var b:Bitmap = new Bitmap(bd);
		b.x = s.width;
		addChild(b);

HTML5 (WebGL):
image

Flash (Works as expected):
image