Step Function Local Accessing Context Object causes SCHEMA_VALIDATION_FAILED

When trying to create a state machine where a state tries to access the context object. Step Function Local is returning SCHEMA_VALIDATION_FAILED on the create-state-machine cli command.

Example Definition which causes the error

{
  "StartAt": "Init",
  "States": {
    "Init": {
      "Type": "Pass",
      "ResultPath": "$.test",
      "Parameters": {
        "start.$": "$$.State.EnteredTime"
      },
      "Next": "Finished"
    },
    "Finished": {
      "Type": "Succeed"
    }
  }
}

The response from the CLI create-state-machine call to Step Function Local

An error occurred (InvalidDefinition) when calling the CreateStateMachine operation: Invalid State Machine Definition: ''SCHEMA_VALIDATION_FAILED: The value for the field 'start.$' must be a valid JSONPath or a valid intrinsic function call at /States/Init/Parameters''

Is it expected that Step Function Local doesn't support the Context Object or is this an unexpected bug?

Thanks