I also ran into this problem, but it was a completely different problem, although the symptoms were the same. As a result, it turned out that I was redirected to the desktop URL, but for mobile phones it was redirected to their server on their mobile site, and that was when he received the encoding twice.
Therefore, it is always worth trying to redirect to a mobile site, if possible, and on a mobile phone.
Hope this helps someone else :)
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