createRenderTarget android bug

Main.hx

package;

import kha.Framebuffer;
import kha.graphics2.Graphics;
import kha.Assets;
import kha.System;
import kha.Image;

class Main {
	
	var actionBtn:Image;
	var minusBtn:Image;
	var size = 100;
	
	public static function main():Void {
		System.init({title: "Empty", width: 800, height: 600}, function() {
			Assets.loadEverything(function() new Main());
		});
	}
	
	public function new():Void {
		initImages();
		System.notifyOnRender(onRender);
	}
	
	inline function initImages():Void {
		actionBtn = Image.createRenderTarget(size, size);
		var g = actionBtn.g2;
		g.begin(true, 0x0);
		g.color = 0xFF000000;
		g.fillRect(10, 10, 50, 10);
		g.end();
		
		minusBtn = Image.createRenderTarget(size, size);
		var g = minusBtn.g2;
		g.begin(true, 0x0);
		g.color = 0xFF000000;
		g.fillRect(10, 10, 10, 50);
		g.end();
		
		//uncomment to fix black rect instead of minusBtn
		//var fix = Image.createRenderTarget(1, 1);
	}
	
	function onRender(frame:Framebuffer):Void {
		var g = frame.g2;
		g.begin(true, 0xFFFFFFFF);
		g.color = 0xFFFFFFFF;
		g.drawImage(actionBtn, 0, 0);
		g.drawImage(minusBtn, size, 0);
		g.end();
	}
	
}