Problem

When using OpenClaw with Feishu channel, messages are being sent twice within ~0.6 seconds. The duplicate message comes from the delivery-mirror internal mechanism.

Evidence

From session logs:

[09:59:38] glm-5 (stop=stop): **当前测试状态：**...
[09:59:39] delivery-mirror (stop=stop): **当前测试状态：**...
  时间差: 0.7秒

This pattern appears consistently across multiple agents (main, obsidian-agent, code-bro) when using Feishu channel.

Analysis

• delivery-mirror is an internal message delivery mechanism
• CHANGELOG mentions fix for Telegram (Gateway injects duplicate Telegram messages into sessions (same message_id) #25835) but Feishu channel still affected
• The duplicate happens after the original message is sent successfully

Expected Behavior

Messages should only be sent once to the Feishu channel.

Environment

• OpenClaw version: 2026.3.2
• Channel: Feishu
• Platform: macOS (Apple Silicon)

Related

• Gateway injects duplicate Telegram messages into sessions (same message_id) #25835 (Telegram fix for delivery-mirror duplicates)