Ion-icons from svg images from assets folder are not showing v5.0.4

ion-icons from svg and images from assets folders are not showing, only blank space shows at the place of ion-icons.
this is package.json:

"dependencies": {
    "@angular/common": "~8.2.14",
    "@angular/core": "~8.2.14",
    "@angular/forms": "~8.2.14",
    "@angular/platform-browser": "~8.2.14",
    "@angular/platform-browser-dynamic": "~8.2.14",
    "@angular/router": "~8.2.14",
    "@ionic-native/barcode-scanner": "^5.22.0",
    "@ionic-native/camera": "^5.26.0",
    "@ionic-native/core": "^5.0.0",
    "@ionic-native/crop": "^5.26.0",
    "@ionic-native/fcm": "^5.23.0",
    "@ionic-native/file": "^5.26.0",
    "@ionic-native/file-transfer": "^5.26.0",
    "@ionic-native/firebase": "^5.0.0-beta.14",
    "@ionic-native/geolocation": "^5.26.0",
    "@ionic-native/image-picker": "^5.26.0",
    "@ionic-native/native-geocoder": "^5.26.0",
    "@ionic-native/native-storage": "^5.22.0",
    "@ionic-native/printer": "^5.23.0",
    "@ionic-native/splash-screen": "^5.0.0",
    "@ionic-native/sqlite": "^5.22.0",
    "@ionic-native/sqlite-porter": "^5.22.0",
    "@ionic-native/status-bar": "^5.0.0",
    "@ionic/angular": "^5.0.0",
    "@ionic/storage": "^2.2.0",
    "@types/dom-to-image": "^2.6.0",
    "angularfire2": "^5.4.2",
    "bootstrap": "^4.4.1",
    "cordova-android": "^8.1.0",
    "cordova-plugin-androidx": "^1.0.2",
    "cordova-plugin-androidx-adapter": "^1.1.1",
    "cordova-plugin-fcm-with-dependecy-updated": "^4.6.2",
    "cordova-plugin-file": "^6.0.2",
    "cordova-plugin-file-transfer": "^1.7.1",
    "cordova-plugin-geolocation": "^4.0.2",
    "cordova-plugin-printer": "^0.8.0",
    "cordova-res": "^0.10.0",
    "cordova-sqlite-storage": "^5.0.0",
    "core-js": "^2.5.4",
    "dom-to-image": "^2.6.0",
    "firebase": "^7.14.0",
    "g": "^2.0.1",
    "phonegap-plugin-barcodescanner": "^8.1.0",
    "rxjs": "~6.5.1",
    "rxjs-compat": "^6.5.5",
    "tslib": "^1.9.0",
    "uk.co.workingedge.cordova.plugin.sqliteporter": "^1.1.1",
    "zone.js": "~0.9.1"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.803.20",
    "@angular/cli": "~8.3.23",
    "@angular/compiler": "~8.2.14",
    "@angular/compiler-cli": "~8.2.14",
    "@angular/language-service": "~8.2.14",
    "@ionic/angular-toolkit": "^2.1.1",
    "@types/jasmine": "~3.3.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "^5.0.0",
    "cordova-plugin-device": "^2.0.2",
    "cordova-plugin-ionic-keyboard": "^2.2.0",
    "cordova-plugin-ionic-webview": "^4.1.3",
    "cordova-plugin-splashscreen": "^5.0.2",
    "cordova-plugin-statusbar": "^2.4.2",
    "cordova-plugin-whitelist": "^1.3.3",
    "jasmine-core": "~3.4.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.1.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.15.0",
    "typescript": "~3.4.3"
  },
  "description": "An Ionic project",
  "cordova": {
    "plugins": {
      "cordova-plugin-whitelist": {},
      "cordova-plugin-statusbar": {},
      "cordova-plugin-device": {},
      "cordova-plugin-splashscreen": {},
      "cordova-plugin-ionic-webview": {
        "ANDROID_SUPPORT_ANNOTATIONS_VERSION": "27.+"
      },
      "cordova-plugin-ionic-keyboard": {},
      "cordova-sqlite-storage": {},
      "uk.co.workingedge.cordova.plugin.sqliteporter": {},
      "phonegap-plugin-barcodescanner": {},
      "cordova-plugin-printer": {
        "ANDROID_SUPPORT_V4_VERSION": "28.+"
      },
      "cordova-plugin-fcm-with-dependecy-updated": {
        "FCM_VERSION": "19.0.0",
        "GRADLE_TOOLS_VERSION": "3.5.3",
        "GOOGLE_SERVICES_VERSION": "4.3.3",
        "SUPPORT_LIBRARY_VERSION": "28.0.0",
        "ANDROID_DEFAULT_NOTIFICATION_ICON": "@mipmap/ic_launcher"
      },
      "cordova-plugin-geolocation": {},
      "cordova-plugin-file-transfer": {},
      "cordova-plugin-file": {}
    }
  },
  "platforms": [
    "android"
  ]
}

this is ionic info:

Ionic:

   Ionic CLI                     : 6.1.0 (C:\Users\Username\AppData\Roaming\npm\node_modules\@ionic\cli)
   Ionic Framework               : @ionic/angular 5.0.4
   @angular-devkit/build-angular : 0.803.25
   @angular-devkit/schematics    : 8.3.25
   @angular/cli                  : 8.3.25
   @ionic/angular-toolkit        : 2.2.0

Cordova:

   Cordova CLI       : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms : android 8.1.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.1.3, (and 8 other plugins)

Utility:
   cordova-res : 0.10.0
   native-run  : 0.3.0

System:

   NodeJS : v12.16.1 (C:\Program Files\nodejs\node.exe)
   npm    : 6.13.4
   OS     : Windows 10
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