Title: Bug: H5P.MathDisplay-1.0 not working – MathJax(input/mml): Can't load error after HTML export

[ThomasG26]

Bug: H5P.MathDisplay-1.0 not working – MathJax(input/mml): Can't load error after HTML export

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Describe the bug

I'm encountering a problem when using the @lumieducation/h5p-html-exporter package and createBundleWithExternalContentResources function.
After exporting an H5P package that uses the H5P.MathDisplay-1.0 library, the generated HTML throws the following error in the browser console:

MathJax(input/mml): Can't load "data:application/javascript;base64,Lyo....[base64 js]Qocik/input/mml.js"

As a result, Math formulas are not rendered correctly.

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To Reproduce

Steps to reproduce the behavior:

1. Use an H5P content type that includes math (e.g. using MathML or LaTeX).
2. Ensure H5P.MathDisplay-1.0 is included in both the player and editor configurations as an addon.
3. Use @lumieducation/h5p-html-exporter to generate an HTML export of the content.
4. Open the exported HTML file in the browser.
5. Check the console – the MathJax loading error appears, and math rendering fails.

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Expected behavior

Math equations should be rendered properly using MathJax in the exported HTML, just like in the H5P player/editor environment.

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Configuration

• @lumieducation/h5p-html-exporter version: ^9.0.10
• Node.js version : 18.12.0
• Browser: Edge
• OS: Windows 11 WSL Ubuntu 20.04

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Additional context

• H5P.MathDisplay is correctly registered in the addons config for both the editor and the player.
• This issue only occurs with the exported HTML; everything works fine within the H5P player/editor.

Let me know if you need a minimal reproduction repo or the relevant configuration – happy to provide it.

Thanks for your work on the project!