Hi,

I couldn't find a reference for this change from 17/Mar/2016 to be implemented in any tzdata revision. I did see that there was a minor correction for Asia/Baku in 2016e DB (for 1992), but not for the change from 2016 and on.

Source https://www.timeanddate.com/news/time/no-dst-azerbaijan.html

BR,

Ariel