Component used: Fragment
Version used:1.3.0-alpha03 up to 1.3.0-alpha05
Devices/Android versions reproduced on: any

Sample code: https://gist.github.com/amihusb/7f2b38904d6245eb1c70064cb3ca6fd4

This is happening because Dialog#onRestoreInstanceState now gets called in DialogFragment#onViewStateRestored and child fragments gets restored their views before parent fragment, dialog restoring its own state and call show() before the parent dialog

public void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
    final Bundle dialogHierarchyState = savedInstanceState.getBundle(DIALOG_HIERARCHY_TAG);
    if (dialogHierarchyState == null) {
        // dialog has never been shown, or onCreated, nothing to restore.
        return;
    }
    dispatchOnCreate(savedInstanceState);
    mWindow.restoreHierarchyState(dialogHierarchyState);
    if (savedInstanceState.getBoolean(DIALOG_SHOWING_TAG)) {
        show();
    }
}