Is this a new thing? My father, when he worked at places that had actual vacation policies, and wasn't a more-or-less independent logging contractor[1], has always been compensated at the end of the year for any unused hours of personal, sick and vacation time.
[1] Loggers, the original Uber-esque contractors-not-employees, wink-wink
[1] Loggers, the original Uber-esque contractors-not-employees, wink-wink