Android Bug: “Node Not Found in Conversation Tree” Causes Subsequent Messages to Disappear

[Maryam_Akhbari]

Environment

• Surface: Web / iOS / Android / macOS / Windows/ Linux
• Browser or app version:
• Affected feature and model, if relevant:

Bug

What happened, and what did you expect?

Reproduction

Steps or a minimal example prompt:

Diagnostics

Exact error or screenshot:
When it happened (with timezone) and how often:

Environment

• Surface: Android
• Device: Samsung Galaxy A50 (SM-A505F/DS)
• Android version: 11
• ChatGPT app version: 1.2026.244 (21)
• Network: Mobile data
• VPN: Unseen Online
• VPN exit location during this reproduction: Estonia
• Private DNS: Off

Bug description

I have reproduced a serious ChatGPT Android conversation-state bug with screenshots.

At approximately 4:58 PM on September 20, 2026 (UTC+03:30), the app displayed:

“Node bbb21f60-0383-4d63-b8e0-a607907f96ca not found in conversation tree”

At the same time, a message showed:

“Failed to send”

I did NOT retry the failed message.

Reproduction steps

1. At 4:58 PM, the conversation entered the failed state above.

2. At 5:00 PM, I checked the VPN.

   • Provider: Unseen Online
   • Exit location: Estonia
   • The connection had already been active for more than two hours.

3. At 5:01 PM, I sent a unique test message:

   TEST-MARYAM-SEP20-1658

   ChatGPT received it and responded normally.

4. At 5:02 PM, I left the