This started being a problem for me because I use Relay a lot as a gain plugin for volume automation.
But I tested it out and noticed a pattern across Neutron and Ozone as well, it seems to be a problem with iZotope plugin compatibility with Studio One
I can use the mouse to set a value that way, and copying and pasting a previous value also works, but if I want to input specific values with right click, it doesn't register, simply stays the same. I have to use shift and drag to slowly go to the value - which is very annoying because it unlocks free horizontal movement as well, so I have to be extremely precise on my mouse movement (if I use this method to set the vertical value and then snap back on the horizontal position, it changes the vertical value again, which I also find odd to be honest)
It's obviously a minor bug but it shouldn't be an issue at all, and I definitely rely on written value inputs every once in a while