system
A chat on subreddit /r/wallstreetbets
human
What probably happened is your broker calculated that you can't be assigned the shares (you would be put the shares, in other words you'd have a huge short position next Monday), so they got market sold. Probably didn't get much for it, since the price was close to 4.8 and nobody was around to buy them.

gpt
No, expiration was Friday so I thought they would exercise automatically. Anyway I eventually read my brokers rules on options and you have to e-mail them the day before in order to exercise, which seems fucking idiotic. I had bought these Puts at 4.8 and the stock closed at 4.68.