diff --git a/configs/full_pipeline_1080p_test_alarm.json b/configs/full_pipeline_1080p_test_alarm.json
index 4071d9e..d345827 100644
--- a/configs/full_pipeline_1080p_test_alarm.json
+++ b/configs/full_pipeline_1080p_test_alarm.json
@@ -366,8 +366,7 @@
             },
             "unknown": {
               "min_track_age_ms": 2000,
-              "min_quality_hits": 4,
-              "reentry_cooldown_ms": 300000
+              "min_quality_hits": 4
             }
           },
           "face_rules": [
diff --git a/plugins/alarm/alarm_node.cpp b/plugins/alarm/alarm_node.cpp
index 6abed7b..7cefa40 100644
--- a/plugins/alarm/alarm_node.cpp
+++ b/plugins/alarm/alarm_node.cpp
@@ -36,7 +36,6 @@ struct FaceTrackAggregationConfig {
     int known_reentry_cooldown_ms = 0;
     int unknown_min_track_age_ms = 2000;
     int unknown_min_quality_hits = 4;
-    int unknown_reentry_cooldown_ms = 0;
     int state_expire_ms = 5000;
 };
 
@@ -97,7 +96,6 @@ FaceTrackAggregationConfig ParseFaceTrackAggregationConfig(const SimpleJson& con
     cfg.known_reentry_cooldown_ms = std::max(0, agg->ValueOr<int>("known_reentry_cooldown_ms", cfg.known_reentry_cooldown_ms));
     cfg.unknown_min_track_age_ms = std::max(0, agg->ValueOr<int>("unknown_min_track_age_ms", cfg.unknown_min_track_age_ms));
     cfg.unknown_min_quality_hits = std::max(1, agg->ValueOr<int>("unknown_min_quality_hits", cfg.unknown_min_quality_hits));
-    cfg.unknown_reentry_cooldown_ms = std::max(0, agg->ValueOr<int>("unknown_reentry_cooldown_ms", cfg.unknown_reentry_cooldown_ms));
     cfg.state_expire_ms = std::max(0, agg->ValueOr<int>("state_expire_ms", cfg.state_expire_ms));
 
     if (const SimpleJson* known = agg->Find("known"); known && known->IsObject()) {
@@ -108,7 +106,6 @@ FaceTrackAggregationConfig ParseFaceTrackAggregationConfig(const SimpleJson& con
     if (const SimpleJson* unknown = agg->Find("unknown"); unknown && unknown->IsObject()) {
         cfg.unknown_min_track_age_ms = std::max(0, unknown->ValueOr<int>("min_track_age_ms", cfg.unknown_min_track_age_ms));
         cfg.unknown_min_quality_hits = std::max(1, unknown->ValueOr<int>("min_quality_hits", cfg.unknown_min_quality_hits));
-        cfg.unknown_reentry_cooldown_ms = std::max(0, unknown->ValueOr<int>("reentry_cooldown_ms", cfg.unknown_reentry_cooldown_ms));
     }
 
     return cfg;
@@ -176,6 +173,11 @@ FaceTrackDecision UpdateFaceTrackState(
     }
 
     if (state.reported_known) return decision;
+    if (!state.reported_known &&
+        state.best_known_person_id >= 0 &&
+        state.known_reentry_suppressed_until_ms > 0) {
+        return decision;
+    }
     if (state.known_reentry_suppressed_until_ms > now_ms) return decision;
     if (IsKnownLeaningTrack(state, cfg)) return decision;
 
diff --git a/tests/test_face_track_alarm.cpp b/tests/test_face_track_alarm.cpp
index bde0166..1fbfdbd 100644
--- a/tests/test_face_track_alarm.cpp
+++ b/tests/test_face_track_alarm.cpp
@@ -405,6 +405,35 @@ TEST(FaceTrackAlarmTest, KnownPersonReEntryTrackCanAlarmAfterCooldownExpires) {
     EXPECT_TRUE(node.face_track_states_.at(82).reported_known);
 }
 
+TEST(FaceTrackAlarmTest, SuppressedKnownReentryTrackDoesNotAgeIntoUnknownAfterSuppressionWindowWobble) {
+    FaceTrackAggregationConfig cfg;
+    cfg.known_min_hits = 2;
+    cfg.known_hit_window_ms = 5000;
+    cfg.known_reentry_cooldown_ms = 5000;
+    cfg.unknown_min_track_age_ms = 1000;
+    cfg.unknown_min_quality_hits = 1;
+
+    std::unordered_map<int, uint64_t> known_identity_last_alarm_ms;
+    const FaceRecogItem initial_track = MakeKnownFace(91, 5, "alice", 0.88f);
+
+    FaceTrackState first_track_state;
+    EXPECT_FALSE(UpdateFaceTrackState(cfg, first_track_state, known_identity_last_alarm_ms, initial_track, 1000).trigger_known);
+    EXPECT_TRUE(UpdateFaceTrackState(cfg, first_track_state, known_identity_last_alarm_ms, initial_track, 1500).trigger_known);
+
+    FaceTrackState reentry_state;
+    FaceRecogItem reentry_track = initial_track;
+    reentry_track.person_track_id = 92;
+
+    EXPECT_FALSE(UpdateFaceTrackState(cfg, reentry_state, known_identity_last_alarm_ms, reentry_track, 4000).trigger_known);
+    EXPECT_FALSE(UpdateFaceTrackState(cfg, reentry_state, known_identity_last_alarm_ms, reentry_track, 4500).trigger_known);
+
+    FaceRecogItem wobble = MakeUnknownFace(92, 5, "alice", 0.42f);
+    const FaceTrackDecision wobble_decision = UpdateFaceTrackState(
+        cfg, reentry_state, known_identity_last_alarm_ms, wobble, 7000);
+    EXPECT_FALSE(wobble_decision.trigger_unknown);
+    EXPECT_FALSE(reentry_state.reported_unknown);
+}
+
 TEST(FaceTrackAlarmTest, IgnoresLegacyDisableFlagAndStillUsesTrackAggregation) {
     AlarmNode node;
     NodeContext ctx;
@@ -445,5 +474,38 @@ TEST(FaceTrackAlarmTest, IgnoresLegacyDisableFlagAndStillUsesTrackAggregation) {
     EXPECT_EQ(node.alarm_count_, 1u);
 }
 
+TEST(FaceTrackAlarmTest, ParsesTrackAggregationWithoutUnknownReentryCooldownContract) {
+    AlarmNode node;
+    NodeContext ctx;
+    ctx.input_queue = std::make_shared<SpscQueue<FramePtr>>(4, QueueDropStrategy::DropOldest);
+
+    const SimpleJson config = ParseConfig(R"({
+        "id": "alarm",
+        "face_rules": [
+            {
+                "name": "unknown_face",
+                "type": "unknown",
+                "cooldown_ms": 0
+            }
+        ],
+        "face_track_aggregation": {
+            "known": {
+                "min_hits": 2,
+                "hit_window_ms": 5000,
+                "reentry_cooldown_ms": 60000
+            },
+            "unknown": {
+                "min_track_age_ms": 1200,
+                "min_quality_hits": 2
+            }
+        }
+    })");
+
+    ASSERT_TRUE(node.Init(config, ctx));
+    EXPECT_EQ(node.track_agg_cfg_.known_reentry_cooldown_ms, 60000);
+    EXPECT_EQ(node.track_agg_cfg_.unknown_min_track_age_ms, 1200);
+    EXPECT_EQ(node.track_agg_cfg_.unknown_min_quality_hits, 2);
+}
+
 }  // namespace
 }  // namespace rk3588