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[Bug]: WebChat UI renders duplicate assistant messages on chat.status final event #85771
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P2Normal backlog priority with limited blast radius.Normal backlog priority with limited blast radius.bugSomething isn't workingSomething isn't workingclawsweeper:linked-pr-openClawSweeper found an open linked pull request for this issue.ClawSweeper found an open linked pull request for this issue.clawsweeper:no-new-fix-prClawSweeper does not recommend queueing a new automated fix PR for this issue.ClawSweeper does not recommend queueing a new automated fix PR for this issue.clawsweeper:source-reproClawSweeper found a high-confidence source-level issue reproduction.ClawSweeper found a high-confidence source-level issue reproduction.impact:message-lossChannel message delivery can be lost, duplicated, or misrouted.Channel message delivery can be lost, duplicated, or misrouted.impact:session-stateSession, memory, transcript, context, or agent state can drift or corrupt.Session, memory, transcript, context, or agent state can drift or corrupt.issue-rating: 🦞 diamond lobsterVery strong issue quality with high-confidence source-level or clear reproduction.Very strong issue quality with high-confidence source-level or clear reproduction.regressionBehavior that previously worked and now failsBehavior that previously worked and now fails
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P2Normal backlog priority with limited blast radius.Normal backlog priority with limited blast radius.bugSomething isn't workingSomething isn't workingclawsweeper:linked-pr-openClawSweeper found an open linked pull request for this issue.ClawSweeper found an open linked pull request for this issue.clawsweeper:no-new-fix-prClawSweeper does not recommend queueing a new automated fix PR for this issue.ClawSweeper does not recommend queueing a new automated fix PR for this issue.clawsweeper:source-reproClawSweeper found a high-confidence source-level issue reproduction.ClawSweeper found a high-confidence source-level issue reproduction.impact:message-lossChannel message delivery can be lost, duplicated, or misrouted.Channel message delivery can be lost, duplicated, or misrouted.impact:session-stateSession, memory, transcript, context, or agent state can drift or corrupt.Session, memory, transcript, context, or agent state can drift or corrupt.issue-rating: 🦞 diamond lobsterVery strong issue quality with high-confidence source-level or clear reproduction.Very strong issue quality with high-confidence source-level or clear reproduction.regressionBehavior that previously worked and now failsBehavior that previously worked and now fails
Type
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Priority
None yet
Bug type
Regression (worked before, now fails)
Beta release blocker
No
Summary
After receiving a single assistant response, the WebChat frontend occasionally renders an identical duplicate message entry in the chat timeline. The backend message log (JSONL transcript) confirms only one message is stored — the duplication occurs on the frontend rendering layer.
Steps to reproduce
Open WebChat dashboard on http://127.0.0.1:18789/
Send a message
Wait for assistant response
Observe: ~1 in ~20 responses shows a duplicate of the assistant message directly below the original
Expected behavior
Each assistant message should appear exactly once in the chat timeline.
Actual behavior
Occasionally, the same assistant message renders twice consecutively. The backend JSONL transcript confirms only one copy — the issue is purely in the frontend rendering pipeline.
OpenClaw version
OpenClaw 2026.5.20 (e510042)
Operating system
macOS 24.6.0 (x64)
Install method
Node v26.0.0
Model
deepseek/deepseek-v4-flash
Provider / routing chain
deepseek
Additional provider/model setup details
No response
Logs, screenshots, and evidence
Impact and severity
No response
Additional information
No response