Markers not loading correctly, console errors ("unsupported URL")

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cordova information: (run $> cordova plugin list)

cordova-plugin-device 2.0.2 "Device"
cordova-plugin-fcm-with-dependecy-updated 4.6.4 "Cordova FCM Push Plugin"
cordova-plugin-googlemaps 2.6.2 "cordova-plugin-googlemaps"
cordova-plugin-inappbrowser 3.2.0 "InAppBrowser"
cordova-plugin-ionic-keyboard 2.2.0 "cordova-plugin-ionic-keyboard"
cordova-plugin-ionic-webview 4.2.1 "cordova-plugin-ionic-webview"
cordova-plugin-network-information 2.0.2 "Network Information"
cordova-plugin-splashscreen 5.0.2 "Splashscreen"
cordova-plugin-statusbar 2.4.2 "StatusBar"
cordova-plugin-whitelist 1.3.3 "Whitelist"

If you use @ionic-native/google-maps, please tell the package.json (only @ionic-native/core and @ionic-native/google-maps are fine mostly)

@ionic-native/google-maps v4.21.0
@ionic-native/core v4.20.0

Current behavior:
After map is loaded sometimes the markers are shown but as soon I move the map (zoom or drag) the markers disappears and I get these errors in console ("unsupported URL").

2020-05-19 10:22:59.139571+0200 AppAgenti[833:22663] Task <270E75CF-877A-4C2B-BBC0-5DCC8B8F7158>.<1> finished with error [-1002] Error Domain=NSURLErrorDomain Code=-1002 "unsupported URL" UserInfo={NSUnderlyingError=0x600000bd16e0 {Error Domain=kCFErrorDomainCFNetwork Code=-1002 "(null)"}, NSErrorFailingURLStringKey=ionic://assets/imgs/markers/map/allevamento-bufale.png, NSErrorFailingURLKey=ionic://assets/imgs/markers/map/allevamento-bufale.png, NSLocalizedDescription=unsupported URL}
2020-05-19 10:22:59.141681+0200 AppAgenti[833:11881] [fail] url = ionic://assets/imgs/markers/map/allevamento-bufale.png
2020-05-19 10:22:59.143074+0200 AppAgenti[833:11881] (error) Can not load image from 'ionic://assets/imgs/markers/map/allevamento-bufale.png'.

Other times the markers are not loaded correctly from the beginning and I get the same errors in console.

Expected behavior:
Markers correctly loaded

Tested on iOS 13.4.1. How can I fix this issue? Thanks

No se nombra ningún archivo fuente, prueba ni punto de entrada. Empieza reproduciendo el fallo de carga de marcadores en iOS 13.4.1 con las versiones indicadas de Cordova e Ionic Native y, después, sigue la URL de imagen ionic:// no compatible durante el movimiento del mapa. Se considera terminado cuando los marcadores se cargan inicialmente y después de hacer zoom o arrastrar, sin estos errores de consola.