Using automatic setting but getting wrong timezone (missing 30 minutes)
Solution 1:
Wow. That looks like a bug that Apple could verify and fix if you filed one. If you’re a developer, use the bug reporter. If not, calling AppleCare and asking them to help you set up the proper time zone, and if they fail, pointing them to this excellent documentation of how you sure look to me did everything correctly.
Worst case, they explain the fix and you can post an answer here for all to learn.