Must add TestData.skipCheckingUUIDsConsistentAcrossCluster = true; to count_config_servers.js so that the checkUUIDsConsistentAcrossCluster check doesn't run on it – like is done here. checkUUIDsConsistentAcrossCluster expects to target primaries, but config_count_servers.js takes down two of the three config servers whilst testing that the count command remains successful – see here.