Why do not mobs or players turn red for a couple of seconds if I kill them?

Who does not know this in Minecraft, if one z. B. Pigs Kill then the pig for a few seconds red so you know that he was killed or the player. Unfortunately, this is true for me, every time I use some shader pack, not a single mob or player turns red when I kill him. So it does not show a red kill effect. Does one know what I can do?

Play without shaders.

This is a bug that has to do with the shader mod, but you can't do anything about it.

OK, because it was not the case with other Youtubers.

Can you please show me the video?