diff --git a/tests/utils/test_visualization_utils.py b/tests/utils/test_visualization_utils.py
index 63ff76c77..760bef1bd 100644
--- a/tests/utils/test_visualization_utils.py
+++ b/tests/utils/test_visualization_utils.py
@@ -37,7 +37,14 @@ def mock_rerun(monkeypatch):
 
     class DummyScalar:
         def __init__(self, value):
-            self.value = float(value)
+            arr = np.asarray(value, dtype=float)
+            # Keep a flat list of values plus a convenience `value` for scalar inputs.
+            self.values = arr.reshape(-1).tolist()
+            self.value = self.values[0] if arr.ndim == 0 else None
+
+    class DummySeriesLines:
+        def __init__(self, names=None):
+            self.names = names
 
     class DummyImage:
         def __init__(self, arr):
@@ -54,6 +61,7 @@ def mock_rerun(monkeypatch):
         __package__="rerun",
         __spec__=SimpleNamespace(name="rerun", submodule_search_locations=None),
         Scalars=DummyScalar,
+        SeriesLines=DummySeriesLines,
         Image=DummyImage,
         log=dummy_log,
         init=lambda *a, **k: None,
@@ -85,6 +93,14 @@ def _obj_for(calls, key):
     raise KeyError(f"Key {key} not found in calls: {calls}")
 
 
+def _obj_for_type(calls, key, type_name):
+    """Find the first object of a given type name logged under a given key."""
+    for k, obj, _kw in calls:
+        if k == key and type(obj).__name__ == type_name:
+            return obj
+    raise KeyError(f"Key {key} with type {type_name} not found in calls: {calls}")
+
+
 def _kwargs_for(calls, key):
     for k, _obj, kw in calls:
         if k == key:
@@ -103,7 +119,7 @@ def test_log_rerun_data_envtransition_scalars_and_image(mock_rerun):
     }
     act = {
         "action.throttle": 0.7,
-        # 1D array should log individual Scalars with suffix _i
+        # 1D array should log a single Scalars batch under one entity path
         "action.vector": np.array([1.0, 2.0], dtype=np.float32),
     }
     transition = {
@@ -120,13 +136,12 @@ def test_log_rerun_data_envtransition_scalars_and_image(mock_rerun):
     # - observation.state.temperature -> Scalars
     # - observation.camera -> Image (HWC) with static=True
     # - action.throttle -> Scalars
-    # - action.vector_0, action.vector_1 -> Scalars
+    # - action.vector -> single Scalars batch under one entity path
     expected_keys = {
         f"{OBS_STATE}.temperature",
         "observation.camera",
         "action.throttle",
-        "action.vector_0",
-        "action.vector_1",
+        "action.vector",
     }
     assert set(_keys(calls)) == expected_keys
 
@@ -139,12 +154,13 @@ def test_log_rerun_data_envtransition_scalars_and_image(mock_rerun):
     assert type(throttle_obj).__name__ == "DummyScalar"
     assert throttle_obj.value == pytest.approx(0.7)
 
-    v0 = _obj_for(calls, "action.vector_0")
-    v1 = _obj_for(calls, "action.vector_1")
-    assert type(v0).__name__ == "DummyScalar"
-    assert type(v1).__name__ == "DummyScalar"
-    assert v0.value == pytest.approx(1.0)
-    assert v1.value == pytest.approx(2.0)
+    # The full vector is logged as one batch so all dimensions share a single view
+    vector_obj = _obj_for_type(calls, "action.vector", "DummyScalar")
+    assert vector_obj.values == pytest.approx([1.0, 2.0])
+
+    # Series keep their `{key}_{i}` names via SeriesLines
+    vector_names = _obj_for_type(calls, "action.vector", "DummySeriesLines")
+    assert vector_names.names == ["action.vector_0", "action.vector_1"]
 
     # Check image handling: CHW -> HWC
     img_obj = _obj_for(calls, "observation.camera")
@@ -178,9 +194,7 @@ def test_log_rerun_data_plain_list_ordering_and_prefixes(mock_rerun):
         "observation.temp",
         "observation.img",
         "action.throttle",
-        "action.vec_0",
-        "action.vec_1",
-        "action.vec_2",
+        "action.vec",
     }
     logged = set(_keys(calls))
     assert logged == expected
@@ -200,11 +214,11 @@ def test_log_rerun_data_plain_list_ordering_and_prefixes(mock_rerun):
     assert img.arr.shape == (5, 6, 3)
     assert _kwargs_for(calls, "observation.img").get("static", False) is True
 
-    # Vectors
-    for i, val in enumerate([9, 8, 7]):
-        o = _obj_for(calls, f"action.vec_{i}")
-        assert type(o).__name__ == "DummyScalar"
-        assert o.value == pytest.approx(val)
+    # Vector logged as a single batch under one entity path, keeping per-dimension names
+    vec = _obj_for_type(calls, "action.vec", "DummyScalar")
+    assert vec.values == pytest.approx([9, 8, 7])
+    vec_names = _obj_for_type(calls, "action.vec", "DummySeriesLines")
+    assert vec_names.names == ["action.vec_0", "action.vec_1", "action.vec_2"]
 
 
 def test_log_rerun_data_kwargs_only(mock_rerun):