Default launch images still copied on iOS when using launch storyboard

For defining the iOS splash screen, I use the new storyboard launch images with this single line:

<splash src="resources/ios/splash/Default@2x~universal~anyany.png" />

Even though I do not use legacy launch images at all, the default cordova launch images are still copied in the app resources and use a lot of disk space for nothing, as shown on this screenshot: