IssueTracker

Component used: Activity

Version used: 1.5.0-alpha05

Devices/Android versions reproduced on: Android 11

It appears that AppCompatActivity mistakenly doesn't set the ViewTreeOnBackPressedDispatcherOwner even though its superclass ComponentActivity does, looks like a copy-paste bug:

ComponentActivity:

    private void initViewTreeOwners() {
        // Set the view tree owners before setting the content view so that the inflation process
        // and attach listeners will see them already present
        ViewTreeLifecycleOwner.set(getWindow().getDecorView(), this);
        ViewTreeViewModelStoreOwner.set(getWindow().getDecorView(), this);
        ViewTreeSavedStateRegistryOwner.set(getWindow().getDecorView(), this);
        ViewTreeOnBackPressedDispatcherOwner.set(getWindow().getDecorView(), this);
    }

AppCompatActivity:

    private void initViewTreeOwners() {
        // Set the view tree owners before setting the content view so that the inflation process
        // and attach listeners will see them already present
        ViewTreeLifecycleOwner.set(getWindow().getDecorView(), this);
        ViewTreeViewModelStoreOwner.set(getWindow().getDecorView(), this);
        ViewTreeSavedStateRegistryOwner.set(getWindow().getDecorView(), this);
    }