Data point:

I recently had a one-night stay out of town. Air con went out at home while I was gone, so I booked local Hyatt for my wife same day, since it was unbearably hot.

Out of town stay posted automatically. Call #1 to Hyatt Diamond line with explanation of my very legitimate situation asking for additional stay credit led to posting of points and Diamond bonus for local stay, but no stay credit. Call #2 led to posting of additional points and Diamond bonus, PLUS Diamond amenity and stay credit.^

HUCA in action.