"player.fovadd" does not work in software, despite software being fully capable of using modified FOVs

I was messing around with modifying the player's FOV dependant on their speed, and found that "player.fovadd" bizarrely does not work in software, despite working perfectly fine in OpenGL

This is strange, since software is fully capable of utilizing modified FOVs through the "fov" console command, as seen in the image below