bug: iOS back transitions between <ion-tabs> pages not animating

[benmarsh]

Bug Report

Ionic version:

[x] 4.3.1

Current behavior:

Demo app confirgured with { mode: 'ios' } and has 2 <ion-tabs> pages. Navigating forward from Tabs A to Tabs B pages animates as expected. Navigating back from Tabs B to Tabs A does not animate. Removing the { mode: 'ios' } config line shows Android style animations working correctly forwards and back.

Expected behavior:

Navigating back from Tabs B to Tabs A page should animate.

Steps to reproduce:

• Create a new app
• Change app.module to run in iOS mode
• Create 2 pages, and navigate forward and back between each one

Related code:

Basic demo is available at: https://github.com/benmarsh/ionic-multi-tabs-test

Other information:

Ionic info:

Ionic:

   ionic (Ionic CLI)             : 4.12.0 (/usr/local/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.3.1
   @angular-devkit/build-angular : 0.13.8
   @angular-devkit/schematics    : 7.3.8
   @angular/cli                  : 7.3.8
   @ionic/angular-toolkit        : 1.5.1

System:

   NodeJS : v11.12.0 (/usr/local/Cellar/node/11.12.0/bin/node)
   npm    : 6.7.0
   OS     : macOS Mojave