In insiders vscode.dev our extension cannot load files into the workspace anymore

[IanMatthewHuff]

Does this issue occur when all extensions are disabled?: No

• VS Code Version: Current insiders.vscode.dev
• OS Version: Web issue only (repro)

The repro steps for this are entering via the VS Code for education route for insiders.vscode.dev

Steps to Reproduce:

1. Login to ppe.vscodeedu.com with MS credentials
2. From the courses list, select the 'Getting Started' course
3. insiders.vscode.dev should be launched with our extension and course loaded
4. At this point you can already see the errors in the dev console
5. But to see the specific issue select the "Coding Challenge" section
   
   In this section a code editor file should have been opened up in the editor, but it is missing.

We see the following in the dev console when the course is loaded. I don't have a full bead on exactly what is happening here, but we have not been changing the extension this sprint, so it seems to be a recent new issue that is just in insiders and not in stable (which works fine still and does not have the errors).

I took a look at recent issues and this one comment appeared here that might be related? #220171 (comment)

[IanMatthewHuff]

insiders.vscode.dev-1721684119886.log

Adding the log file here.

[IanMatthewHuff]

For comparison, this is the same scenario in stable vscode.dev:

And insiders:

Note the errors, plus terminal and editor have not opened up.

[IanMatthewHuff]

@bpasero Hope you don't mind a direct ping here, but I think you might have context both on the VS Code for Education route and possibly on the issue above?

[mjbvz]

@deepak1556 believes this is related to #214588

Looks like we may need to add blob: to the web-worker-ext-host-iframe iframe content security policy. Taking a look at this now

cc @bpasero @alexdima @joaomoreno

[deepak1556]

I was able to verify the issue has been addressed in latest insiders following the steps from OP. @IanMatthewHuff please also confirm on your end. Thanks!

[IanMatthewHuff]

Looks good now. Thanks for the quick fix!