Yeah, it did prompt you if you really wanted to resign. A lot of people had complained about it. Now it is gone. Not sure if the complaints were the cause for the change or what.
Ideally, there would be a Live chess setting to allow you to toggle confirmation on if you wanted it.
So yesterday I was playing a game of blitz chess and wanted to offer a draw to my opponent. I accidently misclicked on resign and immediately resigned. Did their used to be a pop up saying are you sure you want to resign? I'm pretty sure there always has been which is why I was surprised when this happened.
Anyway you can add an are you sure you want to resign interface after clicking the flag on live chess. It's a small problem but one that would be a good improvement. I can't image correspondance chess have a flag which you click on which insta resigns you, there has to be a pop up surely.