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

ソースファイル、テスト、エントリポイントは指定されていません。まず、記載されている Cordova と Ionic Native のバージョンを使って iOS 13.4.1 でマーカーの読み込みに失敗する問題を再現し、その後、地図の移動中に発生する未対応の ionic:// 画像 URL を追跡してください。ズームやドラッグの後も、初期状態と同様にマーカーが読み込まれ、これらのコンソールエラーが発生しなければ完了です。