default kernel selection is being changed after save

[Fxplorer]

Describe the bug

Please provide as much information as you can.

Upon saving a notebook file (specifically .dib here but the .ipynb books exhibit the same behavior on me) where creation of notebook I select "F#".

Upon first save, the code box resets to csharp. Looking at the file in a text editor shows

{"kernelInfo":{"defaultKernelName":"fsharp","items":[{"aliases":[],"languageName":"fsharp","name":"fsharp"}]}}

which should be ok. Manually changing the block back to F# then adding a few new ones, then save again.

file changes to:
{"kernelInfo":{"defaultKernelName":"csharp","items":[{"aliases":[],"name":"csharp"},{"aliases":[],"languageName":"fsharp","name":"fsharp"}]}}

This happens enough times in trying to use notebooks to be quite annoying, and has happened with .dib and .ipynb

Issues that are similar in nature are:
#1309
#1038

and in vscode are:
microsoft/vscode-jupyter#4757
microsoft/vscode#140673
microsoft/vscode-jupyter#4757

Please complete the following:

Which version of .NET Interactive are you using? (In a notebook, run the #!about magic command. ):

Version: 1.0.520801+1e5d205f82c7f5bb1b2e5ce60c680491552cfa23
Library version: 1.0.0-beta.24208.1+1e5d205f82c7f5bb1b2e5ce60c680491552cfa23
Build date: 2024-04-08T08:18:30.0000000Z

• OS
  • Windows 11
  • Windows 10
  • macOS
  • Linux (Please specify distro) : Debian 12 (LMDE6)
  • iOS
  • Android
• Browser
  • Chrome
  • Edge
  • Firefox
  • Safari
• Frontend
  • Jupyter Notebook
  • Jupyter Lab
  • nteract
  • Visual Studio Code
  • Visual Studio Code Insiders
  • Visual Studio
  • Other (please specify)

vscode info:

Version: 1.88.1
Commit: e170252f762678dec6ca2cc69aba1570769a5d39
Date: 2024-04-10T17:34:12.840Z
Electron: 28.2.8
ElectronBuildId: 27744544
Chromium: 120.0.6099.291
Node.js: 18.18.2
V8: 12.0.267.19-electron.0
OS: Linux x64 6.1.0-20-amd64

Screenshots

If applicable, add screenshots to help explain your problem.
A video demo is at the link of https://www.dropbox.com/scl/fi/9p7nzjarbmciyqitib63c/2024-04-18-14-19-55.mp4?rlkey=tknlky6vs9twikwbtfb3ahr13&dl=0

with the following notes:
0:01:20 saving file after selecting F# as default kernal changes the code window to C# when save is done.
0:03:52 shows the text of the example1.dib file after adding a couple new blocks and saving. It has changed some defaults to csharp.