Embedded base64 image not rendered when converting SVG on Linux RHEL (regression since 14.7.1)

[thibnes]

Magick.NET version

Magick.NET-Q8-AnyCPU

Environment (Operating system, version and so on)

LINUX RHEL with .NET 9

Description

When converting an SVG that contains an embedded base64 image (e.g., xlink:href="data:image/jpeg;base64,...) using Magick.NET, the background image is not rendered.
Instead, the output has a white background.

This issue occurs in all versions after 14.7.0.
Version 14.7.0 renders correctly.

Note: there are no issues on Windows platform.

Steps to Reproduce

1. Create a simple SVG with an embedded base64 JPEG, for example:

2. Convert it with Magick.NET:

using (var image = new MagickImage("test.svg"))
{
    image.Write("output.png");
}

3. Compare results:
   ✅ 14.7.0: renders correctly (base64 image + circle visible)

❌ 14.8.0 and newer: only the circle is visible, base64 image missing (white background)

Expected Behavior:
The base64-embedded image should be rendered as part of the SVG, as it was in version 14.7.0.

Images

SVG test file

[dlemstra]

I suspect this has to do with the upgrade of gdk-pixbuf and something broke somewhere. This will probably take a lot of effort to track down and I don't know when I will have time to take a look at this. And it is also possible that this is an issue somewhere else.