don't attempt to bridge join/leave events for internal accounts

    if (event.content.membership === "join") {

      if (event.prev_content?.membership === "join") return; // not a membership join

      if (event.state_key?.startsWith("@_discord_")) return;

      await this.handleRoomJoin(event);

    }

    if (event.content.membership === "leave") {

      if (event.prev_content?.membership === "leave") return; // not a membership leave

      if (event.state_key?.startsWith("@_discord_")) return;

      await this.handleRoomLeave(event);

    }