KBA are not updatable after upgrade

Bug description

User can't change his answers to security questions after AM upgrade from 5.5.1 to 5.5.2. It is automatically tested by com.forgerock.openam.functionaltest.restcommon.user.selfservice.TestUssKbas.Setting KBAs for a user when the realm user sets their KBA answers when the update succeeds when the update is done using REST "beforeEach" hook

How to reproduce the issue

1. install AM 5.5.1
2. upgrade to AM 5.5.2
3. add self service
4. enable forgotten password and security questions
5. login as demo user
6. try to add security question

Expected behaviour

question is added

Current behaviour

There is error, see screen. See debug