diff --git a/source/isaaclab_ov/changelog.d/revert-unmerged-ovrtx-instance-cloning.rst b/source/isaaclab_ov/changelog.d/revert-unmerged-ovrtx-instance-cloning.rst
new file mode 100644
index 000000000000..6a5528be4047
--- /dev/null
+++ b/source/isaaclab_ov/changelog.d/revert-unmerged-ovrtx-instance-cloning.rst
@@ -0,0 +1,4 @@
+Changed
+^^^^^^^
+
+* Reverted the release-only legacy OVRTX instance-cloning changes because the corresponding change has not merged into ``develop``.
diff --git a/source/isaaclab_ov/isaaclab_ov/renderers/ovrtx_renderer.py b/source/isaaclab_ov/isaaclab_ov/renderers/ovrtx_renderer.py
index d7cdd9b28619..641aa4af78a9 100644
--- a/source/isaaclab_ov/isaaclab_ov/renderers/ovrtx_renderer.py
+++ b/source/isaaclab_ov/isaaclab_ov/renderers/ovrtx_renderer.py
@@ -440,15 +440,12 @@ def prepare_stage(self, stage: Any, num_envs: int) -> None:
         # Composed scales must be read while the full stage is still live, before export trims it.
         self._capture_object_scales(stage, self._clone_plan)
 
-        # Unused variant rows retain placeholder source paths but have no spawned prim.
-        # Keep active rows independent so dynamic assets retain their compiled binding paths.
-        active_sources = tuple(
-            path for path, mask in zip(self._clone_plan.sources, self._clone_plan.clone_mask, strict=True) if mask.any()
-        )
+        # The clone plan already identifies every source row. Keep those rows independent so
+        # backend bindings for dynamic assets retain the paths they were compiled against.
         self._exported_usd_string = export_stage_to_string(
             stage,
             num_envs,
-            source_paths=active_sources,
+            source_paths=self._clone_plan.sources,
             keep_env_roots=not self._use_ovstage,
         )
 
diff --git a/source/isaaclab_ov/isaaclab_ov/renderers/ovrtx_usd.py b/source/isaaclab_ov/isaaclab_ov/renderers/ovrtx_usd.py
index 891a9e9c0a7d..2d008bd25e1e 100644
--- a/source/isaaclab_ov/isaaclab_ov/renderers/ovrtx_usd.py
+++ b/source/isaaclab_ov/isaaclab_ov/renderers/ovrtx_usd.py
@@ -14,8 +14,6 @@
 
 from pxr import Sdf, Usd, UsdGeom
 
-from isaaclab.sim.utils import make_uninstanceable
-
 logger = logging.getLogger(__name__)
 
 
@@ -428,10 +426,9 @@ def export_stage_to_string(
     anonymous session layer used only for export, so the input stage remains unchanged.
 
     When ``keep_env_roots`` is True (the legacy ``renderer.clone_usd`` path) the non-source env root prims stay
-    active so the exported stage retains a slot for every env. Nested instances in source subtrees are expanded
-    on the export session because legacy cloning otherwise drops their geometry. The ovstage ``stage.clone``
-    path passes False, retaining source instancing and trimming the non-source env roots themselves;
-    ``stage.clone`` recreates them and the RenderProduct's camera relationship is re-authored after clone.
+    active so the exported stage retains a slot for every env. The ovstage ``stage.clone`` path passes False, which
+    additionally trims the non-source env roots themselves; ``stage.clone`` recreates them and the RenderProduct's
+    camera relationship is re-authored after clone.
 
     Args:
         stage: USD stage to export.
@@ -458,10 +455,6 @@ def export_stage_to_string(
     prim_paths: list[Sdf.Path] = []
 
     if keep_env_roots:
-        # Native legacy cloning omits instanced visuals; expand only the renderer's copy.
-        with Usd.EditContext(export_stage, export_session):
-            for source_path in source_paths:
-                make_uninstanceable(source_path, stage=export_stage)
         for child in envs_prim.GetChildren():
             # Legacy code path: keep env roots so we can query their xforms after opening stage
             child_path = child.GetPath()
diff --git a/source/isaaclab_ov/test/test_ovrtx_clone_plan.py b/source/isaaclab_ov/test/test_ovrtx_clone_plan.py
index 265e8d201d39..c5d215ecc82d 100644
--- a/source/isaaclab_ov/test/test_ovrtx_clone_plan.py
+++ b/source/isaaclab_ov/test/test_ovrtx_clone_plan.py
@@ -350,35 +350,6 @@ def test_prepare_stage_rejects_non_dense_environment_ids(monkeypatch: pytest.Mon
         _make_ovrtx_renderer_without_backend().prepare_stage(_make_multi_env_stage(2), 2)
 
 
-@pytest.mark.parametrize("use_ovstage", [False, True])
-def test_prepare_stage_ignores_unspawned_variant_sources(monkeypatch: pytest.MonkeyPatch, use_ovstage: bool):
-    """Unused variants retain plan rows but have no source prim to export."""
-    num_envs, num_variants = 4, 16
-    stage = _make_multi_env_stage(num_envs)
-    plan = ClonePlan(
-        sources=tuple(f"/World/envs/env_{index}/Robot" for index in range(num_variants)),
-        destinations=("/World/envs/env_{}/Robot",) * num_variants,
-        clone_mask=np.eye(num_variants, num_envs, dtype=np.bool_),
-        env_ids=np.arange(num_envs, dtype=np.int64),
-        positions=np.zeros((num_envs, 3), dtype=np.float32),
-    )
-    _patch_simulation_context(monkeypatch, plan)
-    renderer = _make_ovrtx_renderer_without_backend()
-    renderer._use_ovstage = use_ovstage
-
-    renderer.prepare_stage(stage, num_envs)
-
-    exported_layer = Sdf.Layer.CreateAnonymous(".usda")
-    assert exported_layer.ImportFromString(renderer._exported_usd_string)
-    exported_stage = Usd.Stage.Open(exported_layer)
-    for source in plan.sources[:num_envs]:
-        assert exported_stage.GetPrimAtPath(source)
-    for source in plan.sources[num_envs:]:
-        assert not exported_stage.GetPrimAtPath(source)
-    assert renderer._clone_plan is plan
-    assert len(plan.sources) == num_variants
-
-
 def test_capture_object_scales_populates_source_and_destination_scale_array():
     """Projected source scales reach the body array without replacing a real destination scale."""
     stage = Usd.Stage.CreateInMemory()
diff --git a/source/isaaclab_ov/test/test_ovrtx_usd.py b/source/isaaclab_ov/test/test_ovrtx_usd.py
index d45cc07e059b..1dc05838c820 100644
--- a/source/isaaclab_ov/test/test_ovrtx_usd.py
+++ b/source/isaaclab_ov/test/test_ovrtx_usd.py
@@ -430,8 +430,8 @@ def test_export_stage_without_keep_env_roots_trims_non_source_env_roots():
     """The ovstage clone path also trims the non-source env roots themselves.
 
     ``ovstage.Stage.clone`` requires every target path to not already exist, so the exported stage
-    must not retain env roots that the clone will recreate. The legacy ``renderer.clone_usd``
-    path keeps the roots as placeholders.
+    must not retain env roots that the clone will recreate. This is the only difference from the
+    legacy ``renderer.clone_usd`` path, which keeps the roots as placeholders.
     """
     num_envs = 4
     stage = _make_multi_env_stage(num_envs)
@@ -494,44 +494,6 @@ def test_export_stage_restores_active_state():
         assert stage.GetPrimAtPath(f"{env_path}/Object_env{env_idx}_only").IsActive()
 
 
-@pytest.mark.parametrize(
-    ("num_envs", "keep_env_roots", "keep_instances"),
-    [(4, True, False), (4, False, True), (1, True, True), (1, False, True)],
-)
-def test_export_stage_expands_nested_instances_only_for_legacy_cloning(num_envs, keep_env_roots, keep_instances):
-    """Legacy cloning receives concrete geometry without changing the simulation's instancing."""
-    stage = _make_multi_env_stage(num_envs)
-    mesh = UsdGeom.Mesh.Define(stage, "/MeshPrototype/Mesh")
-    mesh.CreatePointsAttr([(0, 0, 0), (1, 0, 0), (0, 1, 0)])
-    mesh.CreateFaceVertexCountsAttr([3])
-    mesh.CreateFaceVertexIndicesAttr([0, 1, 2])
-    visuals = UsdGeom.Xform.Define(stage, "/RobotPrototype/Visuals").GetPrim()
-    visuals.GetReferences().AddInternalReference("/MeshPrototype")
-    visuals.SetInstanceable(True)
-    robot_path = "/World/envs/env_0/Robot"
-    robot = stage.GetPrimAtPath(robot_path)
-    robot.GetReferences().AddInternalReference("/RobotPrototype")
-    robot.SetInstanceable(True)
-    mesh_path = f"{robot_path}/Visuals/Mesh"
-    assert robot.IsInstance()
-    assert stage.GetPrimAtPath(mesh_path).IsInstanceProxy()
-    input_layers = [layer.ExportToString() for layer in stage.GetLayerStack()]
-
-    exported = export_stage_to_string(stage, num_envs, ("/World/envs/env_0",), keep_env_roots)
-    exported_layer = Sdf.Layer.CreateAnonymous("exported.usda")
-    exported_layer.ImportFromString(exported)
-    exported_stage = Usd.Stage.Open(exported_layer)
-
-    assert exported_stage.GetPrimAtPath(robot_path).IsInstance() == keep_instances
-    assert exported_stage.GetPrimAtPath(f"{robot_path}/Visuals").IsInstanceable() == keep_instances
-    exported_mesh = exported_stage.GetPrimAtPath(mesh_path)
-    assert exported_mesh.IsInstanceProxy() == keep_instances
-    assert UsdGeom.Mesh(exported_mesh).GetPointsAttr().Get() == mesh.GetPointsAttr().Get()
-    assert [layer.ExportToString() for layer in stage.GetLayerStack()] == input_layers
-    assert robot.IsInstance()
-    assert stage.GetPrimAtPath(mesh_path).IsInstanceProxy()
-
-
 def test_create_scene_partition_attributes_all_envs():
     """Scene partition attributes are authored on every env root and camera."""
     num_envs = 4