I tested this by installing the updated timezone data files into a system and checking that the output of Robert's test program from https://www.illumos.org/issues/13467 was unchanged. I also set my timezone to one of the changed ones, America/Santiago and did a few manual checks on the output.
Author: Andy Fiddaman <firstname.lastname@example.org>
14572 Update tzdata to 2022a
Reviewed by: Robert Mustacchi <email@example.com>
Reviewed by: Toomas Soome <firstname.lastname@example.org>
Approved by: Dan McDonald <email@example.com>