These tests call mongoc_topology_invalidate_server and then (if the server is 3.6+) they implicitly send "endSessions" from mongoc_client_destroy or mongoc_client_pool_destroy at the end of the test. For some reason, calling "endSessions" involves two SSL handshakes; the first fails after connectTimeoutMS and the second succeeds instantly.

Why does calling mongoc_topology_invalidate_server during the test cause a failed handshake at the end?

Why does the handshake take connectTimeoutMS to fail instead of failing instantly? And is the problem only with OpenSSL?