Environment

• CLI: 6.3.0
• Cross-platform modules: 6.3.0
• iOS Runtime: 6.3.0

Describe the bug

Using custom tan strip with scrollable content is causing the last portion of the content to be hidden behind the tab strip. Possible related to #7471

To Reproduce

• Deploy on iOS phone/emmulator (works on Android)
• Use this Playground
• Scroll to the bottom - you should be able to see the "END of CONTENT" label but it is hidden behind the tab strip.

Expected behavior

To be able to scroll all scrollable content outside the tabstrip item.

Sample project

https://play.nativescript.org/?template=play-ng&id=xDXBee&v=8&_ga=2.96675223.942765476.1577959082-1966613037.1569573015

Additional context

Probably related to #7471

Reported via t.1447435