VirtualScroll elements disappear to early from the view

@EvenMind wrote:

Hi, since I upgraded from ionic 2.2.1 to the latest 3.9.2 i have an issue with the VirtualScroll.

Here is the start page (there is a toolbar in header):

When i start scroll to the bottom (everything is fine):

When i scroll a bit more, the first element of the list disappear to early and we can see a huge blank space which is awful. It should disappear when the first element is almost visible on the top. :

When I delete the toolbar in the header it fixes the issue so I think the Virtual scroll doesn’t understand that there is this gap between the top of screen and the start of the virtual scroll. How can I tell him that this gap exists?

It happens on both serve and devices.
It happens not only on the first element of list but on all the elements.
 <ion-list [virtualScroll]="feed.posts" approxItemHeight="225px"  no-lines>
    <div class="feed-item" *virtualItem="let post" style="width: 100%">
       <ion-card> ... </ion-card>
    </div>
 </ion-list>
Cordova CLI: 8.0.0
Ionic Framework Version: 3.9.2
Ionic CLI Version: 2.2.1
Ionic App Lib Version: 2.2.0
Ionic App Scripts Version: 3.1.7
ios-deploy version: 1.9.2
ios-sim version: 6.1.2
OS: macOS Sierra
Node Version: v9.3.0
Xcode version: Xcode 9.2 Build version 9C40b