wbmp files have black area after reading

Happens with 3.7.0 but not with 3.6.4. The pom.xml has imageio-jpeg. Using windows 10 and oracle jdk8 almost latest.

    @Test
    public void wbmpTest() throws IOException
    {
        BufferedImage bw = new BufferedImage(500, 500, BufferedImage.TYPE_BYTE_BINARY);
        Graphics2D g = (Graphics2D) bw.getGraphics();
        g.setBackground(Color.white);
        g.fillRect(0, 0, bw.getWidth(), bw.getHeight());
        g.dispose();
        boolean b = ImageIO.write(bw, "wbmp", new File("target","test2.wbmp"));
        Assert.assertTrue(b);
        BufferedImage bim2 = ImageIO.read(new File("target","test2.wbmp"));
        b = ImageIO.write(bim2, "wbmp", new File("target","test3.wbmp"));
        Assert.assertTrue(b);
        for (int x = 0; x < bim2.getWidth(); ++x)
        {
            for (int y = 0; y < bim2.getHeight(); ++y)
            {
                Assert.assertEquals("Difference at " + x + "," + y, bim2.getRGB(x, y), bw.getRGB(x, y));
            }
        }
    }

Original file is white, second file is black and white.

[THausherr]

They fixed it for jdk18.

[haraldk]

Thanks @THausherr for registering all those bug reports and creating a good test case! 👍🏻