API Platform 3 does not return null data in response body - api-platform.com

Question

In API Platform 2.7 the response body contained fields that had a null value, after upgrading to API Platform 3 the response body does not contain fields that have a null value. Is this deliberate or due to a configuration change I need to make.
I executed the same call from the api/docs page for 2.7 and 3.0 I expected the results to be the same.
API Platform 2.7 response for class Patient
{
"#context": "/api/contexts/Patient",
"#id": "/api/patients/8110",
"#type": "Patient",
"account": "/api/accounts/8110",
"accountId": 8110,
"isDependent": false,
"isGuardian": false,
"organization": "/api/organizations/765",
"email": null,
"title": null,
"firstName": "CA",
"middleInitial": "A",
"lastName": "Patient",
"suffix": null,
"photoMedia": null,
"sex": "male",
"birthDate": "2000-01-01T00:00:00+00:00",
"addressLineOne": "5759 Witting Corners",
"addressLineTwo": null,
"city": "Marvintown",
"zipCode": "35507",
"state": {
"#id": "/api/states/681",
"#type": "State",
"abbreviation": "CA"
},
"phoneNumber": "617-491-0000",
"mobileNumber": null,
"workNumber": null
}
API Platform 3.0 response for class Patient
{
"#context": "/api/contexts/Patient",
"#id": "/api/patients/8110",
"#type": "Patient",
"account": "/api/accounts/8110",
"accountId": 8110,
"isDependent": false,
"isGuardian": false,
"organization": "/api/organizations/765",
"firstName": "CA",
"middleInitial": "A",
"lastName": "Patient",
"sex": "male",
"birthDate": "2000-01-01T00:00:00+00:00",
"addressLineOne": "5759 Witting Corners",
"city": "Marvintown",
"zipCode": "35507",
"state": {
"#id": "/api/states/681",
"#type": "State",
"abbreviation": "CA"
},
"phoneNumber": "617-491-0000",
}

Answer 1

Relates to this question
You only need to set skip_null_values to false in your normalization_context, because starting 3.0.0 beta 1 they decided it would become true by default.
If you need it to be false for all resources, you can set the default in your config/packages/api_platform.yaml:
api_platform:
...
defaults:
normalization_context:
skip_null_values: false