[VS Code] Opening the canvas preview for a generated image makes the conversation permanently blank

What version of the IDE extension are you using?

openai.chatgpt@26.5803.61601

What subscription do you have?

Not provided

Which IDE are you using?

VS Code 1.132.0 (commit df53daabb18cd157bdb08c7f01c34df936cf12f4), x64

What platform is your computer?

Microsoft Windows NT 10.0.22631.0 x64

What issue are you seeing?

After generating an image in a Codex conversation in VS Code and opening the generated image in the canvas/artboard preview, the conversation becomes permanently blank in VS Code.

The composer and task header still render, but the entire message/history area is empty. Reopening the same task does not restore the conversation, so that task can no longer be viewed in VS Code.

What steps can reproduce the bug?

1. Open a Codex task in the VS Code extension.
2. Ask Codex to generate an image.
3. After the image is generated, click the canvas/artboard view to preview it.
4. Close the preview or return to the conversation.
5. Reopen the same task.
6. Observe that the task header and composer are visible, but the conversation content is completely blank and remains inaccessible.

What is the expected behavior?

Opening and closing the generated-image canvas/artboard preview should not affect the conversation. The full task history should remain visible and the task should continue to be usable in VS Code.

Additional information

• The failure affects the specific conversation after using the generated-image preview.
• No error message is shown in the UI.