anyOf:
                              - required:
                                - simple
                              - required:
                                - consistentHash
                          - required:
                            - simple
                          - required:
                            - consistentHash
                          properties:

    you may be facing one of the following issues:

    *   **Checkpoint loading failure.** The new optimizer handles optimizer
        state differently from the old optimizer, which simplies the logic of
        checkpoint saving/loading, but at the cost of breaking checkpoint
        backward compatibility in some cases. If you want to keep using an old
        checkpoint, please change your optimizer to