Sonic example doesn't work

I'm following the steps of https://vercel.com/docs/functions/runtimes/python#asynchronous-server-gateway-interface but vercel dev prints:

> Built @vercel/python@latest:api/index.py [7s]
Traceback (most recent call last):
  File "/Users/okonet/Library/Caches/com.vercel.fun/runtimes/python3/../python/bootstrap.py", line 147, in <module>
    lambda_runtime_main()
  File "/Users/okonet/Library/Caches/com.vercel.fun/runtimes/python3/../python/bootstrap.py", line 127, in lambda_runtime_main
    fn = lambda_runtime_get_handler()
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/okonet/Library/Caches/com.vercel.fun/runtimes/python3/../python/bootstrap.py", line 113, in lambda_runtime_get_handler
    mod = importlib.import_module(module_name)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/python@3.11/3.11.2_1/Frameworks/Python.framework/Versions/3.11/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1206, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1178, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1149, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/var/folders/8z/jnh1lm1j6_vbhbc66cyrp3zw0000gn/T/zeit-fun-677899ef016b6/vc__handler__python.py", line 13, in <module>
    __vc_spec.loader.exec_module(__vc_module)
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/private/var/folders/8z/jnh1lm1j6_vbhbc66cyrp3zw0000gn/T/zeit-fun-677899ef016b6/./api/index.py", line 1, in <module>
    from sanic import Sanic
  File "/var/folders/8z/jnh1lm1j6_vbhbc66cyrp3zw0000gn/T/zeit-fun-677899ef016b6/sanic/__init__.py", line 1, in <module>
    from sanic.app import Sanic
  File "/var/folders/8z/jnh1lm1j6_vbhbc66cyrp3zw0000gn/T/zeit-fun-677899ef016b6/sanic/app.py", line 18, in <module>
    from sanic.asgi import ASGIApp
  File "/var/folders/8z/jnh1lm1j6_vbhbc66cyrp3zw0000gn/T/zeit-fun-677899ef016b6/sanic/asgi.py", line 13, in <module>
    from sanic.request import Request
  File "/var/folders/8z/jnh1lm1j6_vbhbc66cyrp3zw0000gn/T/zeit-fun-677899ef016b6/sanic/request.py", line 12, in <module>
    from httptools import parse_url
  File "/var/folders/8z/jnh1lm1j6_vbhbc66cyrp3zw0000gn/T/zeit-fun-677899ef016b6/httptools/__init__.py", line 1, in <module>
    from . import parser
  File "/var/folders/8z/jnh1lm1j6_vbhbc66cyrp3zw0000gn/T/zeit-fun-677899ef016b6/httptools/parser/__init__.py", line 1, in <module>
    from .parser import *  # NoQA
    ^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'httptools.parser.parser'
LambdaError: RequestId: 8320c3a8-dde2-4116-ac93-7f77e3396e24 Process exited before completing request
    at Lambda.<anonymous> (/Users/okonet/.fnm/node-versions/v18.18.2/installation/lib/node_modules/vercel/node_modules/@vercel/fun/dist/src/index.js:110:27)
    at Generator.next (<anonymous>)
    at fulfilled (/Users/okonet/.fnm/node-versions/v18.18.2/installation/lib/node_modules/vercel/node_modules/@vercel/fun/dist/src/index.js:24:58)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Start with the asynchronous server gateway interface example in the linked documentation and its api/index.py entry point. Reproduce the failure with vercel dev and inspect the reported httptools.parser.parser import error. Done means the documented example starts successfully without the ModuleNotFoundError.