Persistent Data Loss in Claude Projects: Conversations Disappearing Without Recovery

Reddit user PurplRains392 reports a critical bug in Claude Projects: conversations created during multi-hour writing sessions are disappearing from the project chat list entirely. The user states: "I have lost entire days of work three times now due to conversations disappearing from my project. The conversations are simply gone. I can see the gap in my chat list - threads from one day, then a jump of 2-3 days, with nothing in between despite a full day of active work."

The missing threads do not appear in search and are not recoverable. The user emphasizes that projects are intended to be persistent storage, making this a fundamental feature failure: "A Project is supposed to be persistent storage. That’s the whole premise of the feature. You’re not using a chat window that you know disappears, you’re working inside a Project, which exists specifically so that the work accumulates and stays."

Anthropic support has been contacted multiple times across all three incidents, but has not responded. There is no escalation path or acknowledgment of the bug. The user warns writers, researchers, and anyone doing long-form work that their work is not safe in Claude Projects.

For developers and writers using Claude Projects, this is a critical reliability concern. The feature promises persistent workspace state, but conversations can vanish without trace. Until Anthropic addresses this, consider external backups or periodic exports.