QDirIterator (using AndroidContentFileEngineIterator) will iterate forever if the folder conatins nested folders.
Steps to reproduce:

• use android 10+
• open Android's file manager and create a few nested folders
• run the following Qt code and choose the to top folder with nested folders

      const auto url = QFileDialog::getExistingDirectory(this);
      QDirIterator it{url, QDirIterator::Subdirectories};
      while(it.hasNext()) {
          qDebug() << it.next();
      }