Sporadic tests failures: server_discovery_and_monitoring.tests.integration.isMaster-timeout

2021/01/27 10:40:53.521] [xUnit.net 00:01:29.31] MongoDB.Driver.Tests.Specifications.server_discovery_and_monitoring.ServerDiscoveryAndMonitoringIntegrationTestRunner.Run(testCase: MongoDB.Driver.Tests.Specifications.server_discovery_and_monitoring.tests.integration.isMaster-timeout.json:Network timeout on Monitor check:async=True) [FAIL]

 [2021/01/27 10:40:53.522] [xUnit.net 00:01:29.31] System.Exception : Unexpected exception was thrown.

 [2021/01/27 10:40:53.522] [xUnit.net 00:01:29.31] ---- System.Exception : Waiting for 1 ServerMarkedUnknownEvent exceeded the timeout 00:00:10. The number of triggered events is 0.