bug: IonMenu's backdrop not displayed on iOS after upgrade from 4.8.1 to 4.9.0/4.9.1

[maxtacco]

Bug Report

Ionic version:

[x] 4.x

Current behavior:
Ionic menu has no backdrop when opened on iOS since version 4.9.0

Expected behavior:
Ionic menu should have backdrop

Other information:
Android is fine. Works fine using 4.8.1

Ionic info:

Ionic:

   Ionic CLI                     : 5.2.4 (/Users/[user]/.nvm/versions/node/v10.15.3/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.9.0
   @angular-devkit/build-angular : 0.13.9
   @angular-devkit/schematics    : 7.3.9
   @angular/cli                  : 7.3.9
   @ionic/angular-toolkit        : 1.5.1

Cordova:

   Cordova CLI       : 9.0.0 ([email protected])
   Cordova Platforms : ios 5.0.1
   Cordova Plugins   : no whitelisted plugins (3 plugins total)

Utility:

   cordova-res : 0.6.0
   native-run  : 0.2.8

[maxtacco]

It looks like both "overlay" and "push" menu types work fine on iOS (tested in Chrome using Dev tools). But, using "reveal" produces the issue. On Android, only "overlay" works fine, both "reveal" and "push" don't add the backdrop.

[tricki]

I have a similar problem where nothing in the menu is clickable on iOS because the ion-content's .transition-cover overlays it.

Plunker: https://next.plnkr.co/edit/83Qz2MFr8B8lD4cc?preview

This demo forces iOS mode. Just open the menu and inspect any menu item which will wrongly select the following element:

Ionic:

   Ionic CLI : 5.2.4 (C:\Users\thomas\AppData\Roaming\npm\node_modules\ionic)

Cordova:

   Cordova CLI       : 9.0.0 ([email protected])
   Cordova Platforms : android 8.0.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 3.1.2, (and 14 other plugins)

Utility:

   cordova-res : 0.6.0
   native-run  : not installed

System:

   Android SDK Tools : 26.1.1 (D:\ProgramFiles\Android\sdk)
   NodeJS            : v10.15.0 (C:\Program Files\nodejs\node.exe)
   npm               : 6.11.3
   OS                : Windows 10

[VIMHaos]

Same problem on iOS after upgrade from 4.8.1 to 4.9.0/4.9.1

[liamdebeasi]

@tricki Can you open a separate issue for this?

I can reproduce the original issue. We will look into it and will post here when we have more to share. Thanks!

[liamdebeasi]

Thanks! This issue has been fixed and will be available in the next release of Ionic.

[maxtacco]

@liamdebeasi Thank you for a quick turnaround!

[calvinckho]

this is to confirm that @ionic/core 4.10.0 have fixed it.

[ionitron-bot]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.