The JLPTN1 deck contains single hiragana. I found the following three cards: ~て, て & る. Users are being promoted to write and read those cards even when having KANA writing disabled. Not to mention the fact that they are inappropriate for such an advanced deck.
Actually after looking at list i could not find it. But I only studied that list and when I search for the card i can find it and it says it was added from that deck.