I agree these shouldn’t be flagged as dupes. Likewise, if the other party’s park is different (e.g. either a multi-park activation, or the other party is doing a rove and hitting several parks during the day), those shouldn’t be counted as dupes, either.
A unique QSO in POTA, as I understand it, is CALL+DATE+BAND+MODE+PARK. If any one of these fields is different, the QSO should not be tagged as a duplicate.
Just to be clear, I can’t speak for other activities or templates. These dupe rules are appropriate for POTA, but for field day I’m not quite sure how the rule sets would differ.
It’s probably very similar (CALL+BAND+MODE is unique) but crossing into another UTC day alone wouldn’t trigger a fresh contact since each unique contact can only be counted once during the entire field day duration.