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Google Chat: replyToMode: "off" does not suppress thread replies #42510

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@svmark

Since v2026.3.1 (PR #30965), Google Chat replies always attach to threads via messageReplyOption=REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD. However, setting channels.googlechat.replyToMode: "off" has no effect — sendText and sendMedia in channel.ts unconditionally forward threadId ?? replyToId to sendGoogleChatMessage, bypassing the replyToMode check. Slack correctly suppresses thread IDs when replyToMode is off; Google Chat should do the same.

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    P1High-priority user-facing bug, regression, or broken workflow.clawsweeper:linked-pr-openClawSweeper 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:source-reproClawSweeper found a high-confidence source-level issue reproduction.impact:message-lossChannel message delivery can be lost, duplicated, or misrouted.issue-rating: 🦞 diamond lobsterVery strong issue quality with high-confidence source-level or clear reproduction.

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