Updates on FP with Shortened Trips

May need to shorten an upcoming trip by a day or two at the beginning. A while back I remember a lot of threads about cancelled FP when you cancel a reservation but there was a lot of conflicting accounts on what actually happened, particularly with respect to FP on days that you have an actual onsite stay or make a new actual onsite stay.

At the very least - I’ve seen almost no posts about FP cancellations at all related to a hotel cancellation within 30 days regardless of whether you change dates or outright cancel. Any recent data?