[BUG] [JAVA] [spring] Examples are not being generated correctly - MIME type example not yet supported

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

I have a schema called Passenger as a part of my RequestBody, which has following example:

       Passenger:
            type: object
            additionalProperties: false
            description: |
                Minimal specification of a passenger.
            required:
                - externalRef
                - passengerType
            properties:
                externalRef:
                    description: |
                        A stable reference to a passenger from the caller system.
                        When received in the request, it must be returned in the response.
                    type: string
                    nullable: false
                    example: passenger1
                passengerType:
                    $ref: '#/components/schemas/PassengerType'
                dateOfBirth:
                    type: string
                    format: date
                    nullable: true
                age:
                    description: |
                        Age of the passenger at the date of travel. Less stable than the date of birth.
                    type: integer
                    format: int32
                    minimum: 0
                    exclusiveMinimum: true
                    nullable: true
                contactDetails:
                    $ref: '#/components/schemas/ContactDetails'
            example:
                externalRef: passenger1
                passengerType: PERSON
                dateOfBirth: 2001-01-01
                contactDetails:
                    firstName: Name
                    lastName: Lastname
                    eMail: name@test.com
                    preferredLanguage: en

After generating endpoints, examples are nowhere to be found, and after calling /v3/api-docs I'm geeting this:

So example values for ContactDeatils are being taken from Warning part

        Warning:
            type: object
            additionalProperties: false
            description: |
                This element can be used to pass non-blocking information or events.
                It is inspired on the JSON Problem structure.
            required:
                - type
            properties:
                type:
                    description: |
                        An absolute URI that identifies the warning type. When dereferenced,
                        it SHOULD provide human-readable documentation for the problem type
                        (e.g., using HTML).
                    type: string
                    format: uri
                    nullable: false
                    default: 'about:blank'
                    example: https://example.com/warns/price-updated
                detail:
                    description: |
                        A human readable explanation specific to this occurrence of the
                        warning.
                    type: string
                    nullable: true
                    example: The price of the given offer part has been updated during the booking operation

And in response from /v3/api-docs this looks like default example for all JsonNullableString:

               "JsonNullableString": {
   			"type": "object",
   			"properties": {
   				"present": {
   					"type": "boolean"
   				}
   			},
   			"description": "A human readable explanation specific to this occurrence of the warning. ",
   			"example": "The price of the given offer part has been updated during the booking operation"
   		}

openapi-generator version

6.2.1

expected output

when checking my source yaml file, examples look like this:

Start by reproducing the issue with the supplied Passenger, ContactDetails, and Warning schemas, then inspect the Java Spring example-generation path and generated /v3/api-docs output. Done means the Passenger and ContactDetails examples are preserved and the output no longer substitutes Warning or JsonNullableString example values.