diff --git a/include/pybind11/detail/smart_holder_type_caster_support.h b/include/pybind11/detail/smart_holder_type_caster_support.h
index 4bb16a7c0..699ce81a4 100644
--- a/include/pybind11/detail/smart_holder_type_caster_support.h
+++ b/include/pybind11/detail/smart_holder_type_caster_support.h
@@ -82,6 +82,19 @@ handle smart_holder_from_unique_ptr(std::unique_ptr<T, D> &&src,
     return inst.release();
 }
 
+template <typename T, typename D>
+handle smart_holder_from_unique_ptr(std::unique_ptr<T const, D> &&src,
+                                    return_value_policy policy,
+                                    handle parent,
+                                    const std::pair<const void *, const type_info *> &st) {
+    return smart_holder_from_unique_ptr(
+        std::unique_ptr<T, D>(const_cast<T *>(src.release()),
+                              std::move(src.get_deleter())), // Const2Mutbl
+        policy,
+        parent,
+        st);
+}
+
 template <typename T, typename D>
 handle
 unique_ptr_to_python(std::unique_ptr<T, D> &&unq_ptr, return_value_policy policy, handle parent) {
@@ -101,6 +114,7 @@ unique_ptr_to_python(std::unique_ptr<T, D> &&unq_ptr, return_value_policy policy
                                      nullptr,
                                      std::addressof(unq_ptr));
 }
+
 template <typename T>
 handle smart_holder_from_shared_ptr(const std::shared_ptr<T> &src,
                                     return_value_policy policy,
diff --git a/tests/test_class_sh_basic.cpp b/tests/test_class_sh_basic.cpp
index 574068a6d..53b7a0f43 100644
--- a/tests/test_class_sh_basic.cpp
+++ b/tests/test_class_sh_basic.cpp
@@ -173,25 +173,25 @@ TEST_SUBMODULE(class_sh_basic, m) {
     m.def("pass_shcp", pass_shcp);
 
     m.def("rtrn_uqmp", rtrn_uqmp);
-    // BAKEIN_BREAK m.def("rtrn_uqcp", rtrn_uqcp);
+    m.def("rtrn_uqcp", rtrn_uqcp);
 
     // BAKEIN_BREAK m.def("pass_uqmp", pass_uqmp);
     // BAKEIN_BREAK m.def("pass_uqcp", pass_uqcp);
 
     m.def("rtrn_udmp", rtrn_udmp);
-    // BAKEIN_BREAK m.def("rtrn_udcp", rtrn_udcp);
+    m.def("rtrn_udcp", rtrn_udcp);
 
     // BAKEIN_BREAK m.def("pass_udmp", pass_udmp);
     // BAKEIN_BREAK m.def("pass_udcp", pass_udcp);
 
     m.def("rtrn_udmp_del", rtrn_udmp_del);
-    // BAKEIN_BREAK m.def("rtrn_udcp_del", rtrn_udcp_del);
+    m.def("rtrn_udcp_del", rtrn_udcp_del);
 
     // BAKEIN_BREAK m.def("pass_udmp_del", pass_udmp_del);
     // BAKEIN_BREAK m.def("pass_udcp_del", pass_udcp_del);
 
     m.def("rtrn_udmp_del_nd", rtrn_udmp_del_nd);
-    // BAKEIN_BREAK m.def("rtrn_udcp_del_nd", rtrn_udcp_del_nd);
+    m.def("rtrn_udcp_del_nd", rtrn_udcp_del_nd);
 
     // BAKEIN_BREAK m.def("pass_udmp_del_nd", pass_udmp_del_nd);
     // BAKEIN_BREAK m.def("pass_udcp_del_nd", pass_udcp_del_nd);
diff --git a/tests/test_class_sh_basic.py b/tests/test_class_sh_basic.py
index 1ad958952..48fa4f6b3 100644
--- a/tests/test_class_sh_basic.py
+++ b/tests/test_class_sh_basic.py
@@ -29,9 +29,9 @@ def test_atyp_constructors():
         (m.rtrn_shmp, "rtrn_shmp"),
         (m.rtrn_shcp, "rtrn_shcp"),
         (m.rtrn_uqmp, "rtrn_uqmp"),
-        # BAKEIN_BREAK (m.rtrn_uqcp, "rtrn_uqcp"),
+        (m.rtrn_uqcp, "rtrn_uqcp"),
         (m.rtrn_udmp, "rtrn_udmp"),
-        # BAKEIN_BREAK (m.rtrn_udcp, "rtrn_udcp"),
+        (m.rtrn_udcp, "rtrn_udcp"),
     ],
 )
 def test_cast(rtrn_f, expected):