Copilot chats listed, but no longer available.

After installing the latest Copilot (September 2026) some of my chats have become corrupted. In the Android phone app, the  Windows 11 app and on copilot.microsoft.com they are listed, but impossible to open delete or rename. I get : "This chat is no longer available".

I have several older and newer chats that work just fine. I think the ghosts was created the same day as the new version was installed on my phone. The automatic installation process did not work well. Had to uninstall and manually reinstall from Google Play.

I have chatted with Microsoft Support about it, and they admit it may be a server-side problem.

Is there anybody with a similar problem? Or maybe somone has a solution? That would be great!