A lot of chaos has resulted, at least according to Reddit [1], which is where I found out about it.
Media doesn't seem to be reporting much on this, the most I've been able to find is one article from before the changeover [2] and a changelog for the IANA tzdb [3].
[1] https://old.reddit.com/r/talesfromtechsupport/comments/x9kr4...
[2] https://www.theregister.com/2022/09/07/microsoft_windows_chi...