cordova-plugin-googlemaps: Can't use markers functions with clustering

I’m submitting a … (check one with “x”) [ ] question [ x ] any problem or bug report [ ] feature request

The plugin version: (check one with “x”) [ ] 1.4.x [ x ] 2.0.0-beta3

If you choose ‘problem or bug report’, please select OS: (check one with “x”) [ x ] Android [ ] iOS

cordova information: (run $> cordova plugin list)

cordova-custom-config 4.0.2 "cordova-custom-config"
cordova-open-native-settings 1.4.1 "Native settings"
cordova-plugin-actionsheet 2.3.3 "ActionSheet"
cordova-plugin-compat 1.1.0 "Compat"
cordova-plugin-console 1.0.7 "Console"
cordova-plugin-device 1.1.6 "Device"
cordova-plugin-dialogs 1.3.3 "Notification"
cordova-plugin-file 4.3.3 "File"
cordova-plugin-file-transfer 1.6.3 "File Transfer"
cordova-plugin-geolocation 2.4.3 "Geolocation"
cordova-plugin-googlemaps 2.0.0-beta3-20170903-1743 "cordova-plugin-googlemaps"
cordova-plugin-mixpanel 3.1.0 "Mixpanel"
cordova-plugin-network-information 1.3.3 "Network Information"
cordova-plugin-request-location-accuracy 2.2.2 "Request Location Accuracy"
cordova-plugin-splashscreen 4.0.3 "Splashscreen"
cordova-plugin-statusbar 2.2.3 "StatusBar"
cordova-plugin-whitelist 1.3.2 "Whitelist"
cordova-plugin-wkwebview-engine 1.1.4-dev "Cordova WKWebView Engine"
cordova-plugin-x-socialsharing 5.1.8 "SocialSharing"
cordova.plugins.diagnostic 3.6.6 "Diagnostic"
es6-promise-plugin 4.1.0 "Promise"
ionic-plugin-deeplinks 1.0.15 "Ionic Deeplink Plugin"
ionic-plugin-keyboard 2.2.1 "Keyboard"
phonegap-plugin-push 1.10.5 "PushPlugin"
uk.co.workingedge.phonegap.plugin.launchnavigator 4.0.4 "Launch Navigator"

Current behavior: When adding the marker cluster, clicking on a markers causes: Uncaught TypeError: marker.one(...).then is not a function

Expected behavior: Should be able to use a marker like I would without clustering.

Steps to reproduce: Create a map with clustering & do something on infoWindow click. If I remove marker.one(...) it works, but how can I handle infoWindow click?

Screen capture or video record:

(I know this is not the error since the InfoWindow opens automatically, but it’s the same kind of error)

Related code, data or error log (please format your code or data):

        this.map.addMarkerCluster({
          boundsDraw: false,
          markers: markers,
          icons: [
            {min: 2, max: 100, url: 'assets/img/blue.png', anchor: {x: 16, y: 16}},
            {min: 100, max: 1000, url: 'assets/img/yellow.png', anchor: {x: 16, y: 16}},
            {min: 1000, max: 2000, url: 'assets/img/purple.png', anchor: {x: 24, y: 24}},
            {min: 2000, max: 5000, url: 'assets/img/red.png', anchor: {x: 32, y: 32}}
          ]
        }).then((markerCluster: MarkerCluster) => {
          markerCluster.on(GoogleMapsEvent.MARKER_CLICK).subscribe((arr: any) => {
            console.log('marker click');
            marker = arr[1];

            marker.one(GoogleMapsEvent.INFO_CLICK).then(() => {
              console.log('info-click')
            });
          });
        });