[Bug] Issues with rendering copilot_errors and copilot_references in GitHub Copilot Chat and VS Code Chat

[Izzzu]

Describe the bug

I'm experiencing an issue with implementing my custom GitHub Copilot extension. When I try to send copilot_errors and copilot_references to the Copilot platform from my extension code, the references and errors are not rendered in GitHub Copilot Chat and also not in VS Code Chat.

To Reproduce

1. Create a GitHub Copilot Extension with GitHub App.
2. Download the sample extension from example prompt with user confirmation.
3. Test the behavior by replacing the user confirmation with references event and errors event using the following code snippets:

copilot_references

const event = "copilot_references";
const data = [{
                "type": "blackbeard.story",
                "id": "snippet"
            }];
response.write(`event: ${event}\ndata: ${JSON.stringify(data)}\n`);

or using preview-sdk.js

response.write(createReferencesEvent(data));

copilot_errors

const event = "copilot_errors";
const data = [{
                "type": "function",
                "code": "recentchanges",
                "message": "There was an error",
                "identifier": "github/hello-world"
            }];
response.write(`event: ${event}\ndata: ${JSON.stringify(data)}\n`);

or using preview-sdk.js

response.write(createErrorsEvent(data));

Github Copilot Chat UI

VS Code Copilot Chat

Expected behavior
The copilot_errors and copilot_references rendered correctly in both GitHub Copilot Chat and VS Code Chat.

Desktop (please complete the following information):

• OS: MacOS Sequoia 15.5
• Browser: Edge
• Version 136.0.3240.76