Broken markdown cells in .dib notebooks

Describe the bug

It seems that yesterday the .net interactive tool updated causing markdown blocks to not be recognized. After loading a .dib file it shows the markdown cells as code cells with #!markdown as the first line.

Steps to reproduce:

1. Create new .dib notebook file
2. Add a markdown cell and enter some text
3. Save the notebook
4. Close and reopen the notebook. The markdown cell is now parsed as a code cell with #!markdown as the first line.

Please complete the following:

Which version of .NET Interactive are you using? There are a few ways to find this out:

• OS
  • Windows 10
  • macOS
  • Linux (Please specify distro)
  • iOS
  • Android
• Browser
  • Chrome
  • Edge
  • Firefox
  • Safari
• Frontend
  • Jupyter Notebook
  • Jupyter Lab
  • nteract
  • Visual Studio Code
  • Visual Studio Code Insiders
  • Other (please specify)

[teknikal-wizard]

I just opened a notebook (Windows 11, VSCode), .NET Interactive updated and everything went crazy. As you say, the code and markdown aren’t respecting the section markers. I see raw markdown before the rendered version, but also the code and markdown blocks bleed into each other. It is basically unreadable.

[brettfo]

We just published extension version 1.0.2459010 which addresses this issue.