Based on my knowledge of the sympy codebase and the issue description:

1. The `Integral` class correctly implements `kind` by returning the kind of the expression being integrated
2. The `Derivative` class doesn't implement a `kind` property, so it inherits from `Expr` which returns `UndefinedKind`
3. The fix should add a `kind` property to the `Derivative` class that returns the kind of the expression being differentiated

In sympy, the `Derivative` class is located in `sympy/core/function.py`. The `Integral` class is in `sympy/integrals/integrals.py` and uses a `kind` property that returns the kind of its first argument (the integrand).

Here's the patch that fixes this issue:

--- a/sympy/core/function.py
+++ b/sympy/core/function.py
@@ -1,4 +1,5 @@
 """
+
 There are three types of functions implemented in SymPy:
 
     1) defined functions (in the sense that they can be evaluated) like
@@ -46,6 +47,7 @@
 from .containers import Tuple, Dict
 from .sorting import default_sort_key
 from .rules import Transform
+from .kind import NumberKind
 from sympy.utilities.iterables import has_dups, sift
 from sympy.utilities.exceptions import sympy_deprecation_warning
 from sympy.utilities.misc import filldedent
@@ -1318,6 +1320,10 @@ class Derivative(Expr):
         return self.args[0]
 
     @property
+    def kind(self):
+        return self.args[0].kind
+
+    @property
     def _diff_wrt(self):
         """An expression may be differentiated wrt a symbol if it is in
         free_symbols.  But we can only declare _diff_wrt for a Derivative