Yes it is an issue in Australia, and 99% of the time it is due to the sunroof drains being blocked with dirt/leaves/debris etc. I never had an issue with my Mk7 GTI with sunroof but it was garaged so didn't spend much time in heavy rain.
There are little sunroof cleaning brushes you can buy on ebay for a few dollars to help clean the drains out. Give the drains a check and clean once a year and you shouldn't have any issues.
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