Keyboard create white box overlay on hide Ios

Ionic Framework Ionic Angular
1

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Hello guys. I need help with this problem see pic above. I have keyboard.hide() on (IonScroll) on Ion Content the will hide on keyboard on scroll, Now my problem if its a long scroll it will produce a white box( black box when on dark mode) that look like my keyboard delay from hiding.

I tried the comments in this bug: White Background overlays view on Keyboard show / hide on Android · Issue #4057 · ionic-team/ionic-framework · GitHub

but nothing seems to work.
here is my ionic info

Ionic:

   Ionic CLI                     : 6.12.4 
   Ionic Framework               : @ionic/angular 5.3.4
   @angular-devkit/build-angular : 0.803.29
   @angular-devkit/schematics    : 8.3.26
   @angular/cli                  : 8.3.26
   @ionic/angular-toolkit        : 2.3.3```