Fix missing group parameter in path-decomposed evolution operators

Author: yomichi

tool/tenes_std.py

@@ -951,9 +951,9 @@ def make_evolution_twosite(
         U = np.dot(U, np.diag(S))
         B = U.reshape((A.shape[0], A.shape[1], dofs[0], -1))
         A = Vt.reshape([B.shape[3]] + dofs[2:] + dofs[1:])
-        ret.append(NNOperator(bond, elements=B))
+        ret.append(NNOperator(bond, elements=B, group=group))
         dofs.pop(0)
-    ret.append(NNOperator(bonds[-1], elements=A))
+    ret.append(NNOperator(bonds[-1], elements=A, group=group))
     return ret