Android: Swiftkey stops working

Swiftkey' Keyboard is not reappearing after minimising and then changing focus to a different text control

To reproduce,

• Install Microsoft SwiftKey keyboard from play store on Android device 
• Make the Microsoft SwiftKey keyboard as your default keyboard
• Launch the QtKeyboardTestApp (attached)
• Tap to focus on TextInput1
• Note the SwiftKey keyboard is automatically shown
• Start typing
• Conclude typing by using the Enter/Return key on the SwiftKey keyboard
• Note the SwiftKey keyboard is now hidden
• Changing focus to TextInput2 and back to TextInput1 does not restore the SwiftKey keyboard hence the bug
• Additional observation: Changing focus to read-only TextEdit and back to TextInput1 restores the SwiftKey keyboard