Camera Filters not working correctly when scrolling

[MiniBobbo]

Haxe version: 3.4.7
Flixel version: 4.5.1 (first noticed on 4.4.1)
OpenFL version: 8.5.0 (first noticed on 8.1.0)
Lime version: 7.1.1 (first noticed on 6.3.1)
Affected targets: HTML5, CPP, maybe others

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Code snippet reproducing the issue:

package;

import flixel.FlxState;

class PlayState extends FlxState
{
	override public function create():Void
	{
		super.create();
		var s = new FlxSprite();
		s.makeGraphic(100, 100, FlxColor.RED);
		add(s);
		FlxTween.tween(FlxG.camera.scroll, {y:100}, 1, {type:FlxTweenType.PINGPONG});
		FlxG.camera.bgColor = FlxColor.GRAY;
		FlxG.camera.setFilters([new BlurFilter()]);
		
	}
}

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Observed behavior:
When a filter is applied to the camera and the camera scrolls, the top of the camera are not rendering correctly. I've never seen the problem on the left and right.

Strangely, this only happens when a sprite is scrolling off the screen. If you remove the sprite the background renders fine.

Expected behavior:

[JoeCreates]

This is an openfl issue openfl/openfl#2107

[JoeCreates]

This is now fixed in openfl and can be closed.