Impossible to connect to a single member replica set through PHP library

[alterphp]

Bug Report

I'm using a single member replica set MongoDB cluster in my development environment (and also in production in some cases), but replica set is well configured. With mongosh, I can connect to the single member by spefying the replicaSet URI parameter and it works well.

Using PHP driver, if I set a replicaSet option, I get an error No suitable servers found (serverSelectionTryOnce set): [connection refused calling hello on '127.0.0.1:27017']. Topology type: ReplicaSetNoPrimary. But through mongosh, I can check that my single member is obviously seen as PRIMARY :

{
  set: 'rs_dev',
  date: ISODate('2024-12-17T17:09:57.780Z'),
  myState: 1,
  term: Long('16'),
  syncSourceHost: '',
  syncSourceId: -1,
  heartbeatIntervalMillis: Long('2000'),
  majorityVoteCount: 1,
  writeMajorityCount: 1,
  votingMembersCount: 1,
  writableVotingMembersCount: 1,
  optimes: { ... },
  lastStableRecoveryTimestamp: Timestamp({ t: 1734455354, i: 1 }),
  electionCandidateMetrics: { ... },
  members: [
    {
      _id: 0,
      name: '127.0.0.1:27017',
      health: 1,
      state: 1,
      stateStr: 'PRIMARY',
      uptime: 3284,
      optime: { ts: Timestamp({ t: 1734455394, i: 1 }), t: Long('16') },
      optimeDate: ISODate('2024-12-17T17:09:54.000Z'),
      lastAppliedWallTime: ISODate('2024-12-17T17:09:54.533Z'),
      lastDurableWallTime: ISODate('2024-12-17T17:09:54.533Z'),
      syncSourceHost: '',
      syncSourceId: -1,
      infoMessage: '',
      electionTime: Timestamp({ t: 1734452114, i: 1 }),
      electionDate: ISODate('2024-12-17T16:15:14.000Z'),
      configVersion: 1,
      configTerm: 16,
      self: true,
      lastHeartbeatMessage: ''
    }
  ],
  ok: 1,
  '$clusterTime': {...},
  operationTime: Timestamp({ t: 1734455394, i: 1 })
}

Environment

I'm not using TLS in dev environment, MongoDB is a Docker container (version 7.0) configured with configured rs_dev ReplicaSet.

Library mongodb/mongodb is 1.19.1 PHP is 8.1 PHP extension is 1.20.1

It seems to be handled the same way by NodeJS driver (same issue described here : https://stackoverflow.com/questions/69531947/replicasetnoprimary-error-although-primary-exists).

Please tell me if this is expected behavior, although mongosh seems OK with single member replica set ?