sympy: rebuild expression if args are passed

Author: JDBetteridge

devito/finite_differences/derivative.py

@@ -268,8 +268,12 @@ def __call__(self, x0=None, fd_order=None, side=None, method=None, **kwargs):
         return self._rebuild(**rkw)
 
     def _rebuild(self, *args, **kwargs):
-        kwargs['preprocessed'] = True
-        return super()._rebuild(**kwargs)
+        if kwargs and not args:
+            kwargs['preprocessed'] = True
+            expr = super()._rebuild(**kwargs)
+        else:
+            expr = self.__class__(*args, **kwargs)
+        return expr
 
     func = _rebuild