diff --git a/tests/e2e/test_kv_interface_e2e.py b/tests/e2e/test_kv_interface_e2e.py
index e3e7ed2..a1a3976 100644
--- a/tests/e2e/test_kv_interface_e2e.py
+++ b/tests/e2e/test_kv_interface_e2e.py
@@ -946,6 +946,29 @@ def test_kv_clear_multiple_keys(self, controller, tq_api):
 
         tq_api.kv_clear(keys=keys[2:], partition_id=partition_id)
 
+    def test_kv_clear_does_not_leak_reused_index_across_partitions(self, controller, tq_api):
+        """Clearing a key in one partition must not make reused indexes visible there again."""
+        field_name = "x"
+        p1 = "clear_reuse_partition_1"
+        p2 = "clear_reuse_partition_2"
+
+        tq_api.kv_put(key="a", partition_id=p1, fields={field_name: torch.tensor([1])})
+        tq_api.kv_clear(keys="a", partition_id=p1)
+
+        tq_api.kv_put(key="b", partition_id=p2, fields={field_name: torch.tensor([2])})
+
+        leaked_meta = tq.get_client().get_meta(
+            data_fields=[field_name],
+            batch_size=1,
+            partition_id=p1,
+            mode="fetch",
+            task_name="clear_reuse_after_other_partition_put",
+        )
+
+        assert leaked_meta.size == 0
+        assert leaked_meta.global_indexes == []
+        assert not leaked_meta.is_ready
+
     def test_kv_clear_idempotent(self, controller, tq_api):
         """Test kv_clear is idempotent for non-existent keys and partitions."""
         partition_id = "test_partition"
diff --git a/tests/test_controller_data_partitions.py b/tests/test_controller_data_partitions.py
index 8f14517..2f6b874 100644
--- a/tests/test_controller_data_partitions.py
+++ b/tests/test_controller_data_partitions.py
@@ -107,6 +107,41 @@ def test_data_partition_status():
     print("DataPartitionStatus tests passed!\n")
 
 
+def test_data_partition_status_production_status_is_partition_local():
+    """Regression test that partitions do not share production_status tensors."""
+    from transfer_queue.controller import DataPartitionStatus
+
+    partition = DataPartitionStatus(partition_id="partition_a")
+    other_partition = DataPartitionStatus(partition_id="partition_b")
+
+    assert partition.production_status.data_ptr() != other_partition.production_status.data_ptr()
+
+
+def test_cleared_partition_does_not_observe_reused_index_from_other_partition():
+    """A cleared partition must not become ready when another partition reuses its index."""
+    from transfer_queue.controller import DataPartitionStatus
+
+    field_schema = {
+        "x": {
+            "dtype": "torch.int64",
+            "shape": (1,),
+            "is_nested": False,
+            "is_non_tensor": False,
+        }
+    }
+
+    partition = DataPartitionStatus(partition_id="partition_a")
+    other_partition = DataPartitionStatus(partition_id="partition_b")
+
+    assert partition.update_production_status([0], ["x"], field_schema=field_schema)
+    partition.clear_data([0], clear_consumption=True)
+    assert partition.scan_data_status(["x"], task_name="consumer_before_reuse") == []
+
+    assert other_partition.update_production_status([0], ["x"], field_schema=field_schema)
+
+    assert partition.scan_data_status(["x"], task_name="consumer_after_reuse") == []
+
+
 def test_partition_interface():
     """Test the partition interface design."""
     print("Testing partition interface design...")
diff --git a/transfer_queue/controller.py b/transfer_queue/controller.py
index 407cb11..7c31522 100644
--- a/transfer_queue/controller.py
+++ b/transfer_queue/controller.py
@@ -332,7 +332,9 @@ class DataPartitionStatus:
     # Values: 0 = not produced, 1 = ready for consumption
     TQ_PRE_ALLOC_SAMPLE_NUM = int(os.environ.get("TQ_PRE_ALLOC_SAMPLE_NUM", 1))
 
-    production_status: Tensor = torch.zeros(TQ_PRE_ALLOC_SAMPLE_NUM, 1, dtype=torch.int8)
+    production_status: Tensor = field(
+        default_factory=lambda: torch.zeros(DataPartitionStatus.TQ_PRE_ALLOC_SAMPLE_NUM, 1, dtype=torch.int8)
+    )
 
     # Consumption status per task - task_name -> consumption_tensor
     # Each tensor tracks which samples have been consumed by that task