CodeBlock are not rendered in snapshot compare mode

[SevrainChea]

Please save me some time and use the following template. In 90% of all issues I can't reproduce the problem because I don't know what exactly you are doing, in which environment, or which y-* version is responsible. Just use the following template even if you think the problem is obvious.

Checklist

• Are you reporting a bug? Use github issues for bug reports and feature requests. For general questions, please use https://discuss.yjs.dev/
• Try to report your issue in the correct repository. Yjs consists of many modules. When in doubt, report it to https://github.com/yjs/yjs/issues/

Describe the bug
I have an issue with displaying CodeBlock using the demos projects.
https://demos.yjs.dev/prosemirror-versions/prosemirror-versions.html

To Reproduce
Steps to reproduce the behavior:

1. Go to https://demos.yjs.dev/prosemirror-versions/prosemirror-versions.html
2. Create a code block
3. Type text
4. Save snapshot
5. Select the saved snapshot

Expected behavior
Seing my text in a code block as changes

Screenshots

Screen.Recording.2025-05-26.at.14.09.37.mov

Environment Information

• Browser / Node.js [e.g. Chrome, Firefox, Node.js]
• Yjs version and the versions of the y-* modules you are using [e.g. yjs v13.0.1, y-webrtc v1.2.1]. Use npm ls yjs to find out the exact version you are using.

Additional context
I am using the demo app as a starting point for my company's project. Our goal is to render snapshots comparisons based on internal HTML snapshots that we already have. We are using Tiptap as our editor.

• I'm a sponsor 💖
• This issue is a blocker for my project.