How can disable Android back button when show loading?

Describe the bug
When show loading, app can back to previous screen by tap on back hardware button on Android.
Flutter/Dart info

`Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.3.9, on macOS 13.0.1 22A400 darwin-x64, locale en-VN)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
[✓] Xcode - develop for iOS and macOS (Xcode 14.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.3)
[✗] Cannot determine if IntelliJ is installed
✗ Directory listing failed
[✓] VS Code (version 1.73.1)
[✓] Connected device (5 available)
! Error: YenDang is busy: Fetching debug symbols for YenDang. Xcode will continue when YenDang is finished. (code -10)
! Error: Dang’s Apple Watch needs to connect to determine its availability. Check the connection between the device and its companion iPhone, and the connection between the iPhone and Xcode. Both devices may also need to be restarted and unlocked. (code 1)
[✓] HTTP Host Availability

! Doctor found issues in 1 category.
`

Start by reproducing the issue on Android with Flutter 3.3.9 while the loading state is visible, then inspect how the package handles the Android hardware back action during loading. Done means tapping the back button no longer returns to the previous screen until loading has finished.