It’s being reported that the talks were cancelled because it was very, very important to the USA to expand the talks to include ballistic missiles. Which tends to lend an amount of credence to the belief that the last exchange of ballistic missiles between Israel and Iran hurt the former a lot more than the media indicated.
I understand that Israel is a lot more eager for war than the media tends to be indicating, which tends to indicate that there will be another round soon whether the USA elects to participate or not.