https://evergreen.mongodb.com/test_log/dot_net_driver_secure_tests__version~latest_os~windows_64_topology~sharded_cluster_auth~auth_ssl~ssl_test_netstandard21_patch_fd5e3f78e86c7ac0d883a344cfc25def118d350e_62140ee232f4176b1fd70f68_22_02_21_22_15_13/0?test_name=0abb3822c0c8123a4ed3a6591bf9bdf8&group_id=&text=true

The issue is related to the fact that we managed RTT and ServerMonitor connections with the same mock object. This gave some race issues. The solution is described in this commit