Error: "NO notebook document for '...'" when repeatedly opening untitled notebooks

[kycutler]

Does this issue occur when all extensions are disabled?: Possibly no (I have only been able to reproduce it with Jupyter+Python enabled, or using a custom extension)

• VS Code Version: 1.88.0-insider
• OS Version: Windows 11

Steps to Reproduce:

1. Open a fresh VS Code Insiders window
2. Run the command "Create: New Jupyter Notebook"
3. Close the new tab and discard changes
4. Repeat steps 2 & 3
5. An error may appear after a few tries. If it doesn't, open a new VS Code window and try again

I have also had success reproducing the issue using a custom extension with the following code:

// 1. Create an untitled notebook.
const notebook = await vscode.workspace.openNotebookDocument(
	"jupyter-notebook",
	new vscode.NotebookData([new vscode.NotebookCellData(vscode.NotebookCellKind.Code, "123", "python")])
);

// 2. Open a second document so the notebook is not visible.
const textDoc = await vscode.workspace.openTextDocument({
	content: "foo bar"
});
await vscode.window.showTextDocument(textDoc);

// 3. Add a new cell to the notebook document.
const edit = new vscode.WorkspaceEdit();
const notebookEdit = new vscode.NotebookEdit(new vscode.NotebookRange(1, 1), [
	{
		kind: vscode.NotebookCellKind.Code,
		value: "456",
		languageId: "python",
		outputs: []
	}
]);
edit.set(notebook.uri, [notebookEdit]);
await vscode.workspace.applyEdit(edit);

// 4. Switch to the notebook document
await vscode.window.showNotebookDocument(notebook);

// 5. Close all editors (Select "Don't save" when prompted)
await vscode.commands.executeCommand("workbench.action.closeAllEditors");

// 6. Create another untitled notebook. This should fail.
await vscode.workspace.openNotebookDocument(
	"jupyter-notebook",
	new vscode.NotebookData([new vscode.NotebookCellData(vscode.NotebookCellKind.Code, "123", "python")])
);