Copilot chat history disappeared after update but conversations are still present in data export

Hello,

I am trying to understand whether other users are experiencing the same issue.

My situation is the following:

• I was actively using Microsoft Copilot Personal.
• I had an important conversation open and was working in it normally.
• Copilot prompted me to install an update.
• I accepted the update.
• Immediately after the update, most of my chat history disappeared.

Additional details:

• I am using the same Microsoft account as before.
• The issue occurs across devices and browsers.
• Some of the missing conversations had been used only a few hours before they disappeared.
• Opening saved links to those conversations shows the error:

"Unable to load the page. There was a problem loading the page. Please try again later."

• However, the missing conversations are still present in my Copilot data export.

Because of this, I do not believe the conversations were intentionally deleted. It appears more like a chat history, synchronization, or loading issue that started immediately after the update.

Has anyone else experienced the same behavior?

Thank you.