split_non_commuting's expected PyTreeDef does not match observed PyTreeDef

[erick-xanadu]

• Expected behavior:

In pytest/test_transform.py, when changing @sum_expand in TestSumExpand to @qml.transforms.split_non_commuting as suggested by the warning, I expect the tree def to remain the same.

• Actual behavior: A tuple is returned instead of a list.

diff --git a/frontend/test/pytest/test_transform.py b/frontend/test/pytest/test_transform.py
index 9fcb8457..a616bdb6 100644
--- a/frontend/test/pytest/test_transform.py
+++ b/frontend/test/pytest/test_transform.py
@@ -41,7 +41,7 @@ try:
 except:  # pylint: disable=bare-except
     from pennylane.transforms import qcut
 
-from pennylane.transforms import merge_rotations, sum_expand
+from pennylane.transforms import merge_rotations
 
 from catalyst import measure, qjit
 from catalyst.utils.exceptions import CompileError
@@ -375,7 +375,7 @@ class TestSumExpand:
         def qnode_builder(device_name):
             """Builder"""
 
-            @sum_expand
+            @qml.transforms.split_non_commuting
             @qml.qnode(qml.device(device_name, wires=2, shots=None))
             def qfunc():
                 """Example taken from PL tests"""