Editing JSON file always leads to "unexpected error, you will lose progress"

[hybridherbst]

Describe the bug

It seems that any kind of change to the typedoc.json file in the stackblitz page here will lead to the "unexpected error" message.

Even something like inserting a space and then saving the file.

Link to the blitz that caused the error

https://stackblitz.com/edit/vitejs-vite-jycujc?file=typedoc.json,package.json&terminal=dev

Steps to reproduce

1. Make sure typedoc.json is open
2. Insert a space
3. Save (ctrl + s or click save button)
4. 

Expected behavior

Can edit the file

Parity with Local

• I have run the project in my local machine and I could not reproduce the issue.

Screenshots

Platform

Browser name  = Chrome
Full version  = 129.0.0.0
Major version = 129
navigator.appName = Netscape
navigator.userAgent = Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
performance.memory = {
  "totalJSHeapSize": 246907219,
  "usedJSHeapSize": 224189123,
  "jsHeapSizeLimit": 4294705152
}
Hash = 134daa3c

Additional context

In the console I see a ton of errors related to StackBlitz' own files not loading, and then upon saving:

Why would that be?