Broken image conversion from WebP to PNG format

[xpetrik]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

ImageSharp version

3.0.0-alpha.0.56

Other ImageSharp packages and versions

2.1.3

Environment (Operating system, version and so on)

Windows 11 (x64)

.NET Framework version

.NET 6

Description

Converting a specific WebP image with an alpha channel to PNG does not work.

Only the outline is visible in the resulting file. WebP does not contain any crazy color profiles (it should contain normal sRGB).

The image causing the problem is attached.

Steps to Reproduce

https://systemartrecordings.blob.core.windows.net/recordings/devenv_AxQTL1Erma.mp4

static void Main(string[] args)
{
    using (var img = Image.Load("c:\\Repositories\\TestingProjects\\ImageSharpWebP\\testimage.webp"))
    {
        img.Save("c:\\Repositories\\TestingProjects\\ImageSharpWebP\\testimage.png");
    }
}

Images

TestImages.zip