Issue with TLS 1.3 Session Resumption in PyOpenSSL

[Smuul]

Description:

I am encountering an issue when attempting to implement session resumption in TLS 1.3 using PyOpenSSL. I have already tried the implementation suggested in #1291.

Scenario:

Client

self.context = SSL.Context(config.secure_version)
self.context.set_session_cache_mode(SSL.SESS_CACHE_CLIENT)

if session is not None:
             self.conn.set_session(session)

try:
                self.conn.set_connect_state()
                self.conn.do_handshake()
                while self._running:
                    data = self.conn.recv(1)
                    if data:
                            self.session = self.conn.get_session()  
                            break         

Server

self.context = SSL.Context(config.secure_version)
self.context.set_session_cache_mode(SSL.SESS_CACHE_SERVER)
self.context.set_session_id(b'12345678123456781234567812345678')

Observations:

The session resumption works correctly with TLS 1.2:

However, the same implementation fails for TLS 1.3. It always creates a new Session Ticket during the second connection attempt:

Questions:

What am I doing wrong in my implementation? Is there anything I might be missing to achieve proper session resumption for TLS 1.3?

Any guidance would be greatly appreciated!