If you managed to cut toughened glass you were extremely lucky to the point of maybe 10million to one or the glass was not toughened
Toughened glass is made by shrinking the outside surfaces which puts the inside of the glass under presure, When the outside surface is damaged (cut) the inside releases the presure and breaks
Im guessing that although your glass may well of have the mark on it, it may well have missed the toughening process?
In 41 years, I have never been able to cut toughened glass by traditional cutter, diamond saws or even alpha cutting (water lazor) although it is sometimes (rearly) able to grind a couple of mm of the edge