"Failed to detach context" error in Open Telemetry tornado instrumentation

Describe your environment
opentelemetry-api==1.9.1
opentelemetry-sdk==1.9.1
opentelemetry-instrumentation-tornado==0.28b1
python 3.8 alpine docker image
enabled traces using SimpleSpanProcessor and ConsoleSpanExporter from the example section

Steps to reproduce

app.py

import tornado.httpclient  # noqa: E402, I202
import tornado.httpserver  # noqa: E402, I202
import tornado.ioloop  # noqa: E402, I202
import tornado.web  # noqa: E402, I202
from urls import url_patterns  # noqa: E402, I202


APP_PORT = 80

SETTINGS = {
    "debug": False,
    "autoreload": True,
    "cookie_secret": "<dummy>",
    "template_path": "<dummy>",
    "static_path": "<dummy>",
    "xsrf_cookies": False
}


class App(tornado.web.Application):
    """App."""
    def __init__(self):
        """Init."""
        tornado.web.Application.__init__(self, url_patterns, **SETTINGS)


def main():
    """Main Method."""
    TornadoInstrumentor().instrument()
    app = App()
    http_server = tornado.httpserver.HTTPServer(app, idle_connection_timeout=180)
    http_server.listen(APP_PORT)
    io_loop = tornado.ioloop.IOLoop.instance()
    tornado.httpclient.AsyncHTTPClient.configure("tornado.curl_httpclient.CurlAsyncHTTPClient")
    io_loop.start()


main()

views.py

implement simple apis.

call an api and response is received by client but server raises Failed to detach context
ERROR:opentelemetry.context:Failed to detach context

What is the expected behavior?
no error

What is the actual behavior?
error

Additional context
doing a poc for tracing.

Start by running the supplied app.py reproduction with the versions listed in the issue and a simple API from views.py. Then inspect the Tornado instrumentation path involved in the request and response lifecycle. Done means the client receives the response without a “Failed to detach context” error.