It isn't new. It's how
MDE's FP system works with separately linked tickets.
A linked valid ticket always has an open 30-day window. When an onsite room is linked, the window expands at exactly 60-days before the check-in date. Disney can't limit the window because a guest can enter a park at any time with a valid ticket; it doesn't matter if it is between 30-59 days before the onsite stay begins.