diff --git a/extensions/slack/src/monitor/message-handler/dispatch.preview-fallback.test.ts b/extensions/slack/src/monitor/message-handler/dispatch.preview-fallback.test.ts
index 115aff7a7355..c6892e7d7d0d 100644
--- a/extensions/slack/src/monitor/message-handler/dispatch.preview-fallback.test.ts
+++ b/extensions/slack/src/monitor/message-handler/dispatch.preview-fallback.test.ts
@@ -3954,6 +3954,7 @@ describe("dispatchPreparedSlackMessage preview fallback", () => {
     );
 
     expect(capturedReplyOptions?.commentaryProgressEnabled).toBe(true);
+    expect(capturedReplyOptions?.commentaryPayloadsEnabled).toBeUndefined();
     expect(capturedReplyOptions?.suppressDefaultToolProgressMessages).toBe(true);
     expect(draftStream.update).toHaveBeenLastCalledWith("_Preparing the smallest fix_");
     expect(draftStream.update.mock.calls.flat().join("\n")).not.toContain("pnpm test");
diff --git a/extensions/slack/src/monitor/message-handler/dispatch.ts b/extensions/slack/src/monitor/message-handler/dispatch.ts
index 513a98b1f6ca..0946a83244bc 100644
--- a/extensions/slack/src/monitor/message-handler/dispatch.ts
+++ b/extensions/slack/src/monitor/message-handler/dispatch.ts
@@ -394,7 +394,6 @@ export async function dispatchPreparedSlackMessage(prepared: PreparedSlackMessag
         commentaryProgressEnabled: progress.commentaryProgressEnabled ? true : undefined,
         progressPreambleEnabled:
           progress.progressDraftActive && slackStreaming.mode === "progress" ? true : undefined,
-        commentaryPayloadsEnabled: progress.commentaryProgressEnabled ? true : undefined,
         onVerboseProgressVisibility: progress.commentaryProgressEnabled
           ? (isActive) => {
               progress.setShouldYieldDraftProgress(isActive);