aws-python-flask-api - Internal Server Error

aws-python-flask-api example works locally correct but after deploy getting {"message":"Internal Server Error"}

How to reproduce:

npm install
pip install -r requirements.txt
serverless deploy

log:

Using default Python executable: python
Packaging Python WSGI handler...

✔ Service deployed to stack aws-python-flask-api-project-dev (92s)

dashboard: https://app.serverless.com/xxxx/apps/aws-flask-api/aws-python-flask-api-project/
endpoint: ANY - https://xxxx.execute-api.eu-west-1.amazonaws.com
functions:
  api: aws-python-flask-api-project-dev-api (11 MB)

cloudwatch:

2022-09-02T04:37:10.629Z	835dece5-1e3a-50f9-5811-e0c60977e8b1	ERROR	Invoke Error 	{
    "errorType": "Error",
    "errorMessage": "Cannot find module './wsgi_handler.js'\nRequire stack:\n- /var/task/s_api.js\n- /var/runtime/UserFunction.js\n- /var/runtime/Runtime.js\n- /var/runtime/index.js",
    "code": "MODULE_NOT_FOUND",
    "requireStack": [
        "/var/task/s_api.js",
        "/var/runtime/UserFunction.js",
        "/var/runtime/Runtime.js",
        "/var/runtime/index.js"
    ],
    "stack": [
        "Error: Cannot find module './wsgi_handler.js'",
        "Require stack:",
        "- /var/task/s_api.js",
        "- /var/runtime/UserFunction.js",
        "- /var/runtime/Runtime.js",
        "- /var/runtime/index.js",
        "    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:902:15)",
        "    at Module._require.i.require (/var/task/serverless_sdk/index.js:9:73131)",
        "    at require (internal/modules/cjs/helpers.js:101:18)",
        "    at Object.<anonymous> (/var/task/s_api.js:25:23)",
        "    at Module._compile (internal/modules/cjs/loader.js:1085:14)",
        "    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)",
        "    at Module.load (internal/modules/cjs/loader.js:950:32)",
        "    at Function.Module._load (internal/modules/cjs/loader.js:790:12)",
        "    at Module.require (internal/modules/cjs/loader.js:974:19)",
        "    at require (internal/modules/cjs/helpers.js:101:18)"
    ]
}

Start with the aws-python-flask-api example and reproduce the deployment using npm install, pip install -r requirements.txt, and serverless deploy. Inspect the generated s_api.js entry point and the reported wsgi_handler.js module failure in CloudWatch. Done means the deployed API endpoint responds successfully without the Internal Server Error.