If your chats look missing on ChatGPT Web, they may not actually be gone. In at least some cases, pinned chats are failing to load in the web UI.

Workaround using the Requestly browser extension:

1. Install Requestly
2. Click New rule
3. Choose Query Param
4. Under If request, set:
   • URL
   • Contains
   • /backend-api/pins
5. In the action section below, leave it on ADD
6. Set:
   • Param Name = limit
   • Param Value = 20
7. Save the rule and refresh ChatGPT

That restored the missing pinned chats for me.

Very short bug description:
The ChatGPT web UI appears to be failing on the pinned chats request, so pinned chats do not render properly in the sidebar.

If you want to report it to OpenAI:
Go to Profile picture → Help → Report a bug and paste this:

Title: Pinned chats not rendering on ChatGPT Web

Pinned chats are failing to render on ChatGPT Web, which can make chats appear missing in the sidebar.

The issue appears to be in the web UI path for the pinned chats request.

Expected behavior:
Pinned chats should render normally on web.