Cordova-plugin-ionic-webview with UseScheme set to true


I’ve upgraded cordova-plugin-ionic-webview to v2.3.1 as recommended in the security alert:

When i set in my config.xml (ionic-v1), I can’t serve any pictures from the new protocol ionic://app.
I Know it’s probably related to the Content-Security-Policy and the allow-navigation parameters but i’ve tried everything and img keeps getting blocked under IOS 11.
Does anyone is able to serve images with this setup ?