Android back button disabled (incorrectly) in ion-navbar

I’m unable to press the back button in the navbar on my Android device. It looks as if it’s in a “disabled” button mode.

Not sure why this is happening. The button works fine in browser and iOS. Additionally, the hardware back button on Android works as expected.

Any suggestions?

  <ion-navbar transparent color="black">

	    <img src="assets/img/icontransparent.png" id="BF-header-icon">



Ionic info:

    @ionic/cli-utils  : 1.12.0
    ionic (Ionic CLI) : 3.12.0

global packages:

    cordova (Cordova CLI) : 7.0.1 

local packages:

    @ionic/app-scripts : 1.3.7
    Cordova Platforms  : android 6.2.3 ios 4.4.0
    Ionic Framework    : ionic-angular 3.3.0


    Android SDK Tools : 25.2.5
    ios-deploy        : 1.9.2 
    ios-sim           : 6.0.0 
    Node              : v8.4.0
    npm               : 2.15.12 
    OS                : macOS High Sierra
    Xcode             : Xcode 9.0 Build version 9A235 


    backend : legacy```