Last message in conversation can disappear

Description

The last message in a conversation can sometimes disappear unexpectedly.

Steps to reproduce

1. Have a conversation with multiple messages
2. [Need more details on exact trigger conditions]

Expected behavior

All messages in the conversation should persist and remain visible.

Actual behavior

The last message in the conversation disappears.

Environment

• OS: macOS (Darwin 24.6.0)
• Claude Code version: [current]

Additional context

Reported by user during normal usage. Exact reproduction steps unclear - may be intermittent.