aws-cdk: aws codepipeline: Stage does not implement IStage in Python

Describe the bug

I’m trying to follow the documentation here: https://docs.aws.amazon.com/cdk/api/v2/python/aws_cdk.aws_codepipeline_actions/README.html#manual-approval-action. My aim is to add an action at the end of a testing stage to destroy the resources I don’t need any more.

However, when I try to call add_action on a StageDeployent object I get the error 'StageDeployment' object has no attribute 'add_action'. When I try to call it on a Stage object, I get the same error: Stage object has no attribute add_action

Expected Behavior

I expect the code to synthesize as written in the docs

Current Behavior

Error as above

Reproduction Steps

class MentorMatchPipeline(Stack):
    def __init__(self, scope: Construct, construct_id: str, **kwargs):
        super().__init__(scope, construct_id, **kwargs)
        pipeline = CodePipeline(self, "MentorMatchPipeline",
                                pipeline_name="Pipeline",
                                synth=ShellStep("Synth",
                                                input=CodePipelineSource.git_hub("mentor-matching-online/mentor-match", "main"),
                                                commands=["npm install -g aws-cdk",
                                                          "cd mentor-match-infra",
                                                          "python -m pip install -r requirements.txt",
                                                          "cdk synth"],
                                                primary_output_directory="mentor-match-infra/cdk.out"
                                                )
                                )
        testing_stage: Stage = MentorMatchAppStage(self, "testing")
        pipeline.add_stage(testing_stage)

        production_stage: StageDeployment = pipeline.add_stage(
            MentorMatchAppStage(self)
        )
        production_stage.add_pre(
            ManualApprovalStep('approval')
        )
        delete_action = CloudFormationDeleteStackAction(
            admin_permissions=True,
            stack_name="MentorMatchStack",
            action_name="delete test stack"
        )
        production_stage.add_action(delete_action) # this should work, but throws an AttributeError

Adding this to an existing pipeline will cause the synth to fail with the error Stage object has no attribute 'add_action'

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.79.1

Framework Version

2.79.1

Node.js Version

20.1.0

OS

Linux

Language

Python

Language Version

3.9.10

Other information

aws-cdk-lib==2.79.1 jsii==1.81.0

ETA: expanded example