Redshift applies its effect to only one screen when there's two or more

When Redshift is activated, if one is using two screens, in my case a laptop one and an external monitor, the color temperature effect is only applied to one of them. In my case, it`s always the external monitor. Neither the screen recorder or the screenshot applications I`m using seem to detect the effect Redshift applies to the screen for some reason so I don`t have any visual evidence of that. But since it`s been tested on a real machine, maybe it`s not complicated to replicate it. Basically, you'll need to connect an external monitor to a laptop and open Redshift. That should do it. Thank you.