The only problem is that the refresh goes from 60hz to 59.940 creating slight annoyances with the menu in Theater View (the movements are not smooth but in small jerks).
In the long run, this solution proved to be very annoying, so I tried to fix the problem again.
I tried doing a clean install of the latest AMD drivers, using DDU in safe mode but didn't fix.
I tried CRU thinking it detected that custom resolution, but it didn't and creating a new 1630p60 resolution, the pc crashed.
I then did an in place installation of Win10, but that resolution still appeared in the Win10 settings panel.
I finally fixed it by reinstalling the 2020 drivers, but this time cleaning up first with DDU in safe mode.
Now everything works, but this means that I will never be able to update the GPU drivers: what if I want to change it?
It seems strange to me that updated drivers are worse than previous ones.