diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_submit.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_submit.rs
index dd614e229..3736cec90 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_submit.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_submit.rs
@@ -4484,21 +4484,49 @@ mod tests {
         context.action_id = pending.action_id.clone();
         context.action_fingerprint = pending.action_fingerprint.clone();
 
-        execute_plan_submit_gdd(&root, &context, &input).expect("commit GDD");
+        let submit_result = execute_plan_submit_gdd(&root, &context, &input).expect("commit GDD");
         assert_eq!(
             fold_plan_provider_usage_into_session_at_locked(&root)
                 .expect("submit batch must defer final usage"),
             PlanProviderUsageFoldOutcome::Deferred
         );
+        // Close the child through the production writer rather than a
+        // hand-rolled terminal state.  It stamps the task projection with the
+        // submit `actionId`, which is what makes the receipt consumption below
+        // collide on the (runId, actionId, phase) idempotency key.  A plain
+        // `append_game_creator_agent_runtime_task` leaves no keyed row, so the
+        // collision never happens and this test passes over a lane that fails
+        // 100% of the time in production.
+        let delivery = new_static_delegate_delivery(
+            GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID,
+            "root-session-001",
+            &context.root_run_id,
+            "parent-action-001",
+            &context.delegation_id,
+            GAME_CREATOR_PROJECT_PLANNING_AGENT_ID,
+            &context.session_id,
+            &context.created_by_run_id,
+        );
+        create_or_read_static_delegate_delivery_at(&root, &delivery)
+            .expect("create planning delivery");
+        mark_static_delegate_delivery_ready_at(
+            &root,
+            GAME_CREATOR_PROJECT_PLANNING_AGENT_ID,
+            &context.session_id,
+            &context.created_by_run_id,
+            &context.delegation_id,
+            "completed",
+            &format!("Fast GDD v{} 已提交。", submit_result.gdd_ref.version),
+        )
+        .expect("close planning delivery");
         let mut child_completed = child_runtime.clone();
-        child_completed.status = "completed".to_string();
-        child_completed.phase = "completed".to_string();
-        child_completed.current_action = "Fast GDD 已提交".to_string();
-        child_completed.pending_tool_action = Some(pending.summary());
-        append_game_creator_agent_runtime_task(&root, &child_completed)
-            .expect("append completed planning child task");
-        write_game_creator_agent_runtime_state(&root, &child_completed)
-            .expect("persist completed planning child state");
+        ensure_project_planning_submit_child_completion_at(
+            &root,
+            &mut child_completed,
+            &pending,
+            &submit_result,
+        )
+        .expect("close planning child at the submit point");
 
         let gdd = read_plan_gdd_chain(&root)
             .expect("read submitted GDD")