At code inspection I have strong believe this commit is the one changing
the behaviour between comment #2 (America/Sao_Paulo) and comment#6 (UTC)

* 8e3260376c Update timezonemap.h, which needs to match

commit 8e3260376c65b762a51eee7c30ab560dadefa1f6
Author: Derick Rethans <[email protected]>
Date:   Tue Oct 24 14:55:13 2017 +0100

    Update timezonemap.h, which needs to match the bundled TZ db

...
-       { "wgst",  1,  -7200, "America/Godthab"               },
-       { "wgt",   0, -10800, "America/Godthab"               },
...


$ git tag --contains  8e3260376c
php-7.0.26
php-7.0.26RC1
php-7.1.12
php-7.1.12RC1
php-7.2.0
php-7.2.0RC5
php-7.2.0RC6

It seems like this update has been backported in upstream 7.0, 7.1, ...
~1month ago.

This would possibly need an SRU to adapt our different PHP package
version where it applies to stay align with new tzdata package.

- Eric

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https://bugs.launchpad.net/bugs/1734967

Title:
  tzdata info for WGT/WGST broken

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