It may sound strange or even weird and I really have no idea about an explanation so this is explicitly not a bug report.
I recently flashed my 10 III with 4.6.0.13 and I am happy with the new release but -maybe coincidentally- every time I set the phone to prefer 5G networks the accuracy of my GPS suffers extremely. With 4G it is 2-4 meters horizontally, with 5G 20-40 meters.
GPS mode is device only. Assisted GPS makes things slightly better.
Good thing is: I don’t need 5G.