diff --git a/app-instance/frontend/lib/task-timeline.test.ts b/app-instance/frontend/lib/task-timeline.test.ts
index 0161dd1..4d40378 100644
--- a/app-instance/frontend/lib/task-timeline.test.ts
+++ b/app-instance/frontend/lib/task-timeline.test.ts
@@ -258,7 +258,10 @@ describe('buildTaskTimelineCards', () => {
         actor_id: 'task-system',
         actor_name: 'Task System',
         text: '可以',
-        created_at: '2026-05-26T10:05:00.000Z',
+        created_at: '2026-05-26T10:05:02.000Z',
+        metadata: {
+          acceptance_type: 'accept',
+        },
       },
     ];
 
diff --git a/app-instance/frontend/lib/task-timeline.ts b/app-instance/frontend/lib/task-timeline.ts
index 2d75620..dd2e125 100644
--- a/app-instance/frontend/lib/task-timeline.ts
+++ b/app-instance/frontend/lib/task-timeline.ts
@@ -168,6 +168,10 @@ function feedbackSummary(feedback: Record<string, unknown>): string | undefined
   return firstString(feedback.comment, feedback.summary, feedback.acceptance_type);
 }
 
+function acceptanceTypeFromRecord(record: Record<string, unknown> | undefined): string | null {
+  return firstString(record?.acceptance_type, record?.feedback_type)?.toLowerCase() ?? null;
+}
+
 function resultSummary(task: BackendTask): string | undefined {
   return firstString(
     task.metadata?.result_summary,
@@ -209,8 +213,29 @@ function compareCardsByCreatedAt(
   return aTime - bTime || a.index - b.index;
 }
 
-function acceptanceKey(runId: string | null | undefined, createdAt: string): string {
-  return `${runId ?? ''}:${createdAt}`;
+type AcceptanceEventIdentity = {
+  runId: string | null;
+  acceptanceType: string | null;
+};
+
+function isCoveredByAcceptanceEvent(
+  feedback: Record<string, unknown>,
+  acceptanceEvents: AcceptanceEventIdentity[],
+): boolean {
+  const feedbackType = acceptanceTypeFromRecord(feedback);
+  if (!feedbackType) return false;
+
+  const feedbackRunId = firstString(feedback.run_id) ?? null;
+  const matchingTypeEvents = acceptanceEvents.filter((event) => event.acceptanceType === feedbackType);
+
+  if (feedbackRunId) {
+    return (
+      matchingTypeEvents.some((event) => event.runId === feedbackRunId) ||
+      (matchingTypeEvents.length === 1 && !matchingTypeEvents[0].runId)
+    );
+  }
+
+  return matchingTypeEvents.length === 1;
 }
 
 export function buildTaskTimelineCards(input: BuildTaskTimelineCardsInput): TaskTimelineCard[] {
@@ -220,7 +245,7 @@ export function buildTaskTimelineCards(input: BuildTaskTimelineCardsInput): Task
   const processArtifacts = input.processArtifacts ?? task.process_artifacts ?? [];
   const runsById = buildRunMap(processRuns);
   const runsWithProgressEvents = new Set<string>();
-  const acceptanceEventKeys = new Set<string>();
+  const acceptanceEvents: AcceptanceEventIdentity[] = [];
   let hasResultEventCard = false;
   const cards: TaskTimelineCard[] = [
     {
@@ -246,7 +271,10 @@ export function buildTaskTimelineCards(input: BuildTaskTimelineCardsInput): Task
       hasResultEventCard = true;
     }
     if (type === 'acceptance') {
-      acceptanceEventKeys.add(acceptanceKey(event.run_id, event.created_at));
+      acceptanceEvents.push({
+        runId: firstString(event.run_id) ?? null,
+        acceptanceType: acceptanceTypeFromRecord(event.metadata),
+      });
     }
 
     cards.push({
@@ -322,7 +350,7 @@ export function buildTaskTimelineCards(input: BuildTaskTimelineCardsInput): Task
     const feedback = task.feedback[index];
     const runId = firstString(feedback.run_id) ?? null;
     const createdAt = feedbackCreatedAt(feedback, task);
-    if (acceptanceEventKeys.has(acceptanceKey(runId, createdAt))) continue;
+    if (isCoveredByAcceptanceEvent(feedback, acceptanceEvents)) continue;
 
     cards.push({
       id: `${task.task_id}:acceptance:${index}`,