Link affordances don't survive a Jackson serialization and deserialzation

In a REST controller test I compare an object with an added self link with the result of a HTTP transport (via TestRestTemplate). The result is not equal to the original, because the deserialized link has no affordance, where the original after adding the link has one. The reason seems to be the discrepancy between the @JsonIgnore on affordances and the inclusion of this member in the equals method.
This can simply be reproduced by test case according to the following (incomplete) example:

    @Test
    public void serializeWithLink() throws JsonProcessingException {

        SomeClassWithRepresentationModel  expected =  createThisObject();
        Link selfLink = linkTo(methodOn(SomeSpringRestController.class).methodForGetRequest()).withSelfRel();
        expected.add(selfLink);

        ObjectMapper objectMapper = new ObjectMapper(); // Jackson object mapper
        String jsonSerial = objectMapper.writeValueAsString(expected);
        SomeClassWithRepresentationModel actual = objectMapper.readValue(jsonSerial, SomeClassWithRepresentationModel.class);

        Assertions.assertEquals(expected, actual);
    }

At least in my special case with a real object and a real REST controller this test fails.