Ionic-v4 VirtualScroll on screen orientation change

The IonVirtualScroll component does not update when the screen orientation changes. I have tried something like this, which was recommended in earlier versions of Ionic:

this.screenOrientation.onChange().subscribe(()=>{
    virtualScroll.readUpdate(true)
    virtualScroll.writeUpdate(true)
})

However those methods no longer exist in Ionic-v4 and I can’t find any other equivalent method. Is there one?

Err, I found checkRange(0,list.length) triggers an update.