Kristian, I did wonder about tacking this onto your thread, but thought it might be best to do a seperate one and easier for people to find it...
I plan to check all areas of the carpet for damp every 12 months!
Have a 2019 GT and found the above problem! Once I started searching, it was clearly a well documented fault!
I replaced the 'cloth/tape' type covers over the hole in the A post with a rubber grommet epoxy resined in (and did the passenger side).
Then noticed water coming in between the bottom...