IVS Realtime "Listener" Participant Events

I've set up an Audio room using IVS Realtime where there are two types of participants, speakers and listeners. My problem is I only see STAGE_PARTICIPANT_JOINED events trigger for "speaker" participants, not "listeners".

When a "speaker" joins the stage, their token includes both the "PUBLISH" and "SUBSCRIBE" capabilities and their strategy looks like:

      const strategy = {
        stageStreamsToPublish() {
          return [micStream];
        },
        shouldPublishParticipant(participant: StageParticipantInfo) {
          return true;
        },
        shouldSubscribeToParticipant(participant: StageParticipantInfo) {
          switch (participant?.attributes?.role) {
            case "speaker":
              return SubscribeType.AUDIO_ONLY;
            case "listener":
              return SubscribeType.NONE;
            default:
              return SubscribeType.NONE;
          }
        },
      };

and when a "listener" joins the stage, their token only includes the "SUBSCRIBE" capability and their strategy looks like:

     const strategy = {
      stageStreamsToPublish() {
        return [];
      },
      shouldPublishParticipant(participant: StageParticipantInfo) {
        return false;
      },
      shouldSubscribeToParticipant(participant: StageParticipantInfo) {
        switch (participant.attributes.role) {
          case "speaker":
            return SubscribeType.AUDIO_ONLY;
          case "listener":
            return SubscribeType.NONE;
          default:
            return SubscribeType.NONE;
        }
      },
    };

My event handler for STAGE_PARTICIPANT_JOINED events just console logs the participant info and, as mentioned, I only see this happen when a participant joins with role "speaker".

I've tested various combinations of strategies and capabilities for the listener but I don't see any events unless I match the settings to that of a "speaker" which means adding a stream to publish and I'll need to request microphone access. I'd really like to avoid this as I don't think that should be necessary if the participant will never publish audio.

Is there a way to have a participant join without a publishable stream and still see STAGE_PARTICIPANT_JOINED events for that participant?