IOS 11.1.1 modal page bug

Hi, after updating my iPad to ios 11.1.1 I have noticed the bug when displaying modal pages, there are 2 phases when the modal is showing: the first short flash and the second normal modal view transition. The same when the modal window is hiding but reverse order: the normal transition to hide and then a short flash. Not sure you can see this effect on uploaded Conference App movie but it is very annoying in the real app. There is no such effect in the previous ios 11.0.2

cli packages: (/usr/local/lib/node_modules)

    @ionic/cli-utils  : 1.18.0
    ionic (Ionic CLI) : 3.18.0

global packages:

    cordova (Cordova CLI) : 7.1.0 

local packages:

    @ionic/app-scripts : 3.1.0
    Cordova Platforms  : ios 4.5.3
    Ionic Framework    : ionic-angular 3.9.2


    ios-deploy : 1.9.2 
    ios-sim    : 5.0.13
    Node       : v6.10.0
    npm        : 3.10.10 
    OS         : macOS High Sierra
    Xcode      : Xcode 9.1 Build version 9B55

ok, modals work well after updating to ios 11.1.2