Vector3.ToString "rounds" decimals after build

Hi,

I'm trying to get very precise Input.mousePosition with Input.mousePosition.x.ToString("F4"); and in the editor everything works fine. I get 4 decimal signs exacly how I need it. However, after I build the app, I get x.0000 all the time.

What important is, that, in the editor, I don't get zeroes only when I choose precise resolution and not the aspect ratio or Free Aspect. I was trying to play around with build resolution settings, for example disabling all aspect ratios, setting exact resolution, windowed/fullscreen mode. Nothing helps so far.

It seems like the built app sort of disables inbetween pixel position, and I have no idea why.

Thanks in advance for any advice.