https://github.com/boostorg/ptr_container/issues/36
Index: boost-1.81.0/libs/ptr_container/test/serialization.cpp
===================================================================
--- boost-1.81.0.orig/libs/ptr_container/test/serialization.cpp
+++ boost-1.81.0/libs/ptr_container/test/serialization.cpp
@@ -203,8 +203,6 @@ void test_serialization_unordered_set_he
     std::remove( fn.c_str() );
 
     BOOST_CHECK_EQUAL( vec.size(), vec2.size() );
-    BOOST_CHECK_EQUAL( (*vec2.begin()).i, -1 );
-    BOOST_CHECK_EQUAL( (*++vec2.begin()).i, 0 );
 }
 
 template< class Map, class OArchive, class IArchive >