All firmware on both JVC and Oppo are latest.
I started with a full factory reset obvious place to start at the beginning and then went through every setting with the 10m cable and 4m that I know works on every setting from the Oppo.
Each time a setting was changed or cable swapped both machines were switched off to make sure each change started from the same place each time
Each time the 10m cable wouldn't display the oppo menu when the Output setting is UHD Auto (4K (3840)50) at the JVC
Unless the cable come with cert label it's not worth buying.
I've decided to put my Oppo less than 5 meters from the JVC with a new HDMI Certified Cable. Now I don't have any issues.