Registration object not available in JWT Populate Lambda when using self service registration

[robotdan]

Registration object not available in JWT Populate Lambda immediately following registration

Description

If you are using a populate lambda, and basic self service registration the JWT populate lambda invoked to generate a JWT on the Token exchange will not have access to the registration object.

If you have code such as the following example, the registration object may be null and cause an exception when executing the lambda.

function(jwt, user, registration) {
  jwt.preferred_username = registration.username;
}

Additional symptoms are that if you are using the implicit grant, the applicationId and roles claims will be missing from the JWT.

Affects versions

1.18.0, 1.18.1, 1.18.2, 1.18.3

Expected behavior

The registration object should be available in the lambda.

Additional context

Add any other context about the problem here.