iOS / iPhone : Virtual keyboard not showing on landscape mode

Hello everyone !

This is my first post here, so I hope I’m not doing anything wrong.

After searching here and there, I couldn’t find anything close enought to my issue. So i’m posting it here. I would like to know if some of you had to deal with the following issue :

On iPhone (iOS 12+), while on landscape mode, when hitting on a TextField input or a StageText, the keyboard is not showing at all.

Thing is, we DO NOT have that problem if we put the app on portrait mode, or on iPad (portrait or landscape), which is quite weird.

I also notice that in landscape on iPhone, the statusbar is hidden, like it would be if the app was set to be on fullscreen mode (which is not the case in our code).

We tested that on iPhone 7 (iOS 12 and 13), iPhone XS max (iOS 13) and iPad mini 2 (iOS 12).

We are using the AIR SDK 33.1.1.98 + Flex SDK 4.6.0 on Windows 10, using FlashDevelop (for coding and compiling) + Adobe Animate (to make a UI.swc library only).

Here is our application.xml description for our app
(yes I know there’s some useless stuff that we could get rid of) 

<?xml version="1.0" encoding="utf-8"?>
<application xmlns="http://ns.adobe.com/air/application/33.1">
  <id>com.caprenov</id>
  <versionLabel>5.2.0</versionLabel>
  <versionNumber>5.2.0</versionNumber>
  <filename>CapRenov</filename>
  <name>CapRenov+</name>
  <initialWindow>
    <title>CapRenov+</title>
    <content>CapRenovMobile.swf</content>
    <systemChrome>standard</systemChrome>
    <transparent>false</transparent>
    <visible>true</visible>
    <minimizable>true</minimizable>
    <maximizable>true</maximizable>
    <resizable>true</resizable>
    <autoOrients>false</autoOrients>
    <aspectRatio>landscape</aspectRatio>
  </initialWindow>
  <icon>
    <image40x40>icons/iOS40.png</image40x40>
    <image58x58>icons/iOS58.png</image58x58>
    <image76x76>icons/iOS76.png</image76x76>
    <image80x80>icons/iOS80.png</image80x80>
    <image120x120>icons/iOS120.png</image120x120>
    <image152x152>icons/iOS152.png</image152x152>
    <image167x167>icons/iOS167.png</image167x167>
    <image180x180>icons/iOS180.png</image180x180>
    <image1024x1024>icons/iOS1024.png</image1024x1024>
  </icon>
  <iPhone>
    <assetsCar>Assets.car</assetsCar>
    <InfoAdditions>
      <![CDATA[
        <key>UIDeviceFamily</key>
        <array>
          <string>1</string>
          <string>2</string>
        </array>
        <key>NSAppTransportSecurity</key>
        <dict>
          <key>NSAllowsArbitraryLoads</key><true/>
        </dict>
        <key>CFBundleIconName</key>
        <string>AppIcon</string>
        <key>UILaunchStoryboardName</key>
        <string>LaunchScreen</string>
      ]]>
    </InfoAdditions>
    <requestedDisplayResolution>high</requestedDisplayResolution>
  </iPhone>
</application>

We didn't had that issue ~2 years ago, when we 1st tested our app on iPhone… Any idea ?