Great question! There was once a time when I could tell you the number of times it has happened, but unfortunately the hard drive of the PC that contained the software I could've used to find the answer died. I have and use different lottery software in my current PC, and it doesn't have some of the functionality that the software on my old PC had.
I do know that when I used my old PC to learn the answer to the same question you've asked, (but I didn't do it for Fantasy5 as I was living in New York at the time, and I did it for NY's Take5 game) there were just a handful of times when all five winning numbers came from the same "decade". (Singles, Teens, Twenty's & Thirty's) Take5 has a history of more than 8,000 drawings and FF5 currently has 7,358.
It's a little harder for all five winning numbers to come from the Singles due to the fact there are nine numbers in that particular group. So there is a smaller subset of combo's within the Singles. It's hardest of all for the Thirty's to have five winning numbers to come from that group due to just seven numbers being included in the Thirty's decade.
Added to the fact that the Singles number group has nine numbers is that all five winning numbers were odd. (there are a total of 8,568 all odd number combo's out of FF5's total of 376,992, but not all 8,586 are in just one number group) How many combo's of five odd numbers are contained within the Singles number group is another good question. And how many times has a combo like that been drawn? (probably once and that was this recent one)
So this is something that probably wont be seen again for quite a while. But then, who knows? Sixty times since July of 2001, a set of five FF5 winning numbers was drawn for a second time. The sixty-th time it happened was on August 26th, 2021. Everybody says that shouldn't happen, but it does. G5