(stepfunctions): RuntimeError: machine.grantStartExecution is not a function

[ghost]

Describe the bug

I'm trying to set my statemachine as a target for eventbridge. The statemachine and Rule are fine when I build them individually (tested by synthesizing the template). The problem comes when I .add_target().

start_state = sfn.Pass(self, 'StartState',
            result=sfn.Result.from_object(
                {"hello": "ssc"}),
                result_path="$.hello"
        )
        # lambda and tasks 
        upload_to_bucket = _lambda.Function(
            self, "UploadToBucketFunction",
            runtime=_lambda.Runtime.PYTHON_3_9,
            handler="index.handler",
            code=_lambda.Code.from_asset(
                path.join("lambda", "upload_to_bucket"),
            ),
            initial_policy=[
                iam.PolicyStatement(
                    resources=["*"],
                    actions=["s3:PutObject"]
                )
            ]
        )

        first_step = tasks.LambdaInvoke(
            self, "UploadToBucketSFNInvoke",
            payload=sfn.TaskInput.from_object({
                "test": sfn.JsonPath.string_at("$.hello")
            }),
            lambda_function=upload_to_bucket
        )
        event_role = iam.Role(
            self, "EventRole",
            assumed_by=iam.ServicePrincipal("events.amazonaws.com")
        )

        sfnMachine = sfn.StateMachine(
            self, id, 
            definition=start_state.next(first_step)
        )

        trigger_sfn_rule = events.Rule(
            self, "TriggerSFNRule",
            description="Trigger Step Functions when a new domain document is uploaded",
            event_pattern=events.EventPattern(
                source=["aws.s3"],
                detail_type=["New object created"],
                detail={
                    "eventSource": ["s3.amazonaws.com"],
                    "eventName": ["ObjectCreated:Put"],
                },
                resources=[source_bucket_arn]
            ),
            schedule=events.Schedule.rate(
                Duration.days(1)
            )
        )
        sfnMachine.grant_execution(event_role)
        trigger_sfn_rule.add_target(
            targets.SfnStateMachine(
                start_state,
                input=events.RuleTargetInput.from_object({
                    "bucket_arn": output_bucket_arn,
                    # set file here
                })
            ),
            role=event_role
        )

Expected Behavior

The template should synthesize.

Current Behavior

I am getting this error message: RuntimeError: machine.grantStartExecution is not a function. When I check the docs for Typescript, grantStartExecution is indeed a function, so I'm not sure why it's saying otherwise.

Reproduction Steps

Add a statemachine as a target to an eventbridge rule, synthesize it, and it should repeat the error message.

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.85.0

Framework Version

No response

Node.js Version

v16.13.1

OS

Mac OS

Language

Python

Language Version

Python 3.11.2

Other information

No response

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