Nav header and back button disappearing on 1.3.4


I have tab based layout.
I’m navigating from my home page to sub page.
My sub page contains from html view inside <ion-contents>.
in the html I have a button which is near to left border.
When I’m swiping from right to left on button area the <ion-nav-back-button> and <ion-nav-bar> are disappearing.
It is disappearing also when I’m swiping on text area, but it is appearing back when I’m stopping to swipe.

Any help on this?