Radio Santa María (Coyhaique) reported Wednesday (in Spanish)[1] of a
delay in the decision whether Chile’s Aysén Region will switch from
-04/-03 (with DST) to all-year -03. A government representative denied
that the delay is due to Interior Minister Carolina Tohá’s resignation
Tuesday to run for president, and Tohá’s replacement that day by Álvaro
Elizalde.

If the Interior Ministry decides to go ahead with the change, this would
invalidate current TZDB for Aysén at some future point. A plausible time
for this would be April 5 at 24:00, which is short notice for people
responsible for operating systems in the region. Perhaps someone with
connections in Chile could suggest making any change in April 2026
rather than this year.

The attached hypothetical patch shows one way that this might play out
in four weeks. I have not installed this patch into the TZDB development
repository, though, as the situation is too iffy.

[1]:
https://www.radiosantamaria.cl/2025/03/05/regional-huso-horario-anunciaran-en-los-proximos-dias-si-continuara-o-no-con-el-horario-de-verano/