После многочисленных запусков теста он начинает выдавать fail

После многочисленных успешных запусков тестов в этом методе и схожих, где используются коллекции у меня выдает fail. Вот код метода теста:

    @Test
  void findAllWithBooks() {
    var book1 = bookDao.save(generateBook("Test1", "Test1"));
    var book2 = bookDao.save(generateBook("Test2", "Test2"));
    var book3 = bookDao.save(generateBook("Test3", "Test3"));
    var book4 = bookDao.save(generateBook("Test4", "Test4"));
    var reader1 = readerDao.save(generateReader("Test1"));
    var reader2 = readerDao.save(generateReader("Test2"));
    bookDao.borrow(book1.getId(), reader1.getId());
    bookDao.borrow(book2.getId(), reader1.getId());
    bookDao.borrow(book3.getId(), reader2.getId());
    Map<Reader, List<Book>> expectedMap = Map.of(
            reader1, List.of(book2, book1),
            reader2, List.of(book3)
    );

    Map<Reader, List<Book>> actualMap = readerDao.findAllWithBooks();

    assertThat(actualMap).isEqualTo(expectedMap);
  }

Метод bookDao.borrow работает корректно, но вот его код:

    @Override
  public void borrow(long bookId, long readerId) {
    var query = "UPDATE book SET reader_id = ? WHERE id = ?";
    try (var connection = DBUtil.getConnection();
        var borrowStatement = connection.prepareStatement(query)) {
      borrowStatement.setLong(1, readerId);
      borrowStatement.setLong(2, bookId);
      borrowStatement.executeUpdate();
    } catch (SQLException e) {
      throw new DaoOperationException(
          String.format("Error borrowing book with id: %d for reader id: %d", bookId, readerId), e);
    }
  }

Код из метода findAllWithBooks():

@Override
  public Map<Reader, List<Book>> findAllWithBooks() {
    var query =
        """
                SELECT
                  reader.id AS readerId,
                  reader.name AS readerName,
                  book.id AS bookId,
                  book.name AS bookName,
                  book.author AS bookAuthor,
                  book.reader_id
                FROM reader
                  LEFT JOIN book ON reader.id = book.reader_id
                """;
    try (var connection = DBUtil.getConnection();
        var selectAllReadersWithBooksStatement = connection.createStatement()) {
      var resultSet = selectAllReadersWithBooksStatement.executeQuery(query);
      Map<Reader, List<Book>> map = new HashMap<>();
      while (resultSet.next()) {
        var borrowedBooks =
            map.computeIfAbsent(DaoUtils.mapResultSetToReader(resultSet), k -> new ArrayList<>());
        if (resultSet.getString("bookName") != null) {
          var book = DaoUtils.mapResultSetToBook(resultSet);
          borrowedBooks.add(book);
        }
      }
      return map;
    } catch (SQLException e) {
      throw new DaoOperationException("Error finding readers with borrowed books list!");
    }
  }

И вот сообщение, которое показывается при fail-e:

org.opentest4j.AssertionFailedError: expected: {Reader{id=114, name='Test2'}=[Book{id=146, name='Test3', author='Test3', readerId=0}], Reader{id=113, name='Test1'}=[Book{id=145, name='Test2', author='Test2', readerId=0}, Book{id=144, name='Test1', author='Test1', readerId=0}]} but was: {Reader{id=113, name='Test1'}=[Book{id=144, name='Test1', author='Test1', readerId=113}, Book{id=145, name='Test2', author='Test2', readerId=113}], Reader{id=114, name='Test2'}=[Book{id=146, name='Test3', author='Test3', readerId=114}]}

at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) at dao.ReaderDaoIT.findAllWithBooks(ReaderDaoIT.java:73) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)