aaPanel_Kern
I could workaround by creating an "alias" at Nginx config file at Website -> [website domain] -> Config
With that it is capable to reach the validation file for SSL renewal.
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I had to wait for about 50 days to see if the automatic certificate renewal is fully working, but it is not.
There is another problem that seems to be a bug at the renewal mechanism.
The certificate will expire in 28 days, but according to the Cron job there is no certificate withing the 30 days of expiration to perform the renewal.
Seems the Cron job looks for the certificate expiration somewhere else, instead the certificate itself.
Is that because two months ago I had to manually renew the certificate one time using the "Renewal SSL" button?
Any idea how to fix to have the automatic renewal working properly again?