openclaw - 💡(How to fix) Fix [Bug]: Mattermost: group/public channel messages not received via WebSocket (regression in 2026.4.8) [1 participants]

Bug type

Regression (worked before, now fails)

Beta release blocker

No

Summary

Mattermost bots do not receive or process WebSocket events for public/group channel messages in 2026.4.8. DMs work correctly.

Steps to reproduce

1. Configure Mattermost channel with chatmode: "oncall", groupPolicy: "open", "blockStreaming": true, "replyToMode": "off"
2. Bot connects successfully (mattermost connected as @botname)
3. Send @botname mention in a public channel
4. No log entry appears — message is silently dropped
5. Send a DM to the bot — works correctly

Expected behavior

Bot should receive and process channel messages (at minimum when @mentioned in oncall mode).

Actual behavior

Channel messages are silently dropped. No log entry appears at any log level (info, debug, trace). DMs to the same bot work correctly and produce expected
log entries (sessionKey=agent:main:mattermost:direct:*). Bot is confirmed as channel member via REST API, and messages are confirmed present via /channels/{id}/posts.

OpenClaw version

2026.4.8

Operating system

macOS (Darwin 24.6.0) — Mac Mini, arm64

Install method

npm install -g openclaw

Model

anthropic/claude-sonnet-4-6

Provider / routing chain

Anthropic (direct API key)

Additional provider/model setup details

No response

Logs, screenshots, and evidence

Impact and severity

No response

Additional information

Workaround

Downgrade to 2026.4.2: npm install -g [email protected]