During a Proton Mail Plus → Unlimited upgrade, my separate, active Lumo Plus subscription was silently cancelled without any warning or consent. My Lumo chat history disappeared immediately. I have since reverted to Mail Plus and re-subscribed to Lumo Plus, but the history has not returned. This appears to be permanent data loss caused by your checkout flow.

Nowhere in the checkout flow does Proton warn users that switching (upgrading) to the Unlimited plan will downgrade their Lumo Plus subscription to Lumo Free, nor that chats outside the 7-day window will be lost.

WHY THIS IS A BUG AND NOT USER ERROR
1. Silent cancellation: Active, separately-invoiced subscription terminated without confirmation
2. No warning: Nothing indicated that the upgrade would affect Lumo Plus

WHAT SHOULD HAPPEN
1. Immediate fix: Add explicit warnings to checkout flows: "Adding [Plan X] may affect your active Lumo Plus subscription. Continue?"
2. Preservation requirement: Before any downgrade, export/hold encrypted chats for 30 days so users can re-subscribe and restore access
3. Notification: Email alerts when subscriptions are affected by other plan changes
4. Manual recovery path: Support ability to audit when encrypted blobs were last synced/accessed, and flag cases where data may be held server-side beyond 7 days

REQUESTED ACTIONS
• Confirm whether my chats were deleted by the Free tier's 7-day window or hidden pending entitlement restoration
• If deletable: Change the retention behavior to hide rather than delete for subscription lapses under 30 days
• If deletable: Implement a grace period buffer for re-subscribing users
• Flag this as a critical bug and prioritize a fix across all plan combinations that interact with Lumo Plus

I have invoices I can provide.