Do modulate env_fades not work in TF2?

For my map, I'm trying to apply a fade to the players screen using the modulate effect. The VDC mentions that this should essentially color correct your scene rather than fade to a solid color, which is exactly what I'm looking for- however, it seems that whenever I trigger the fade in game, it simply fades to solid black instead.





Is there something I'm doing wrong, or do modulate fades just not work in TF2? The VDC makes no mention of it not working in TF2, so that's what's left me confused. Help is very appreciated!