Blindness effect doesn't work

[Peach774]

• Minecraft Version: 1.12.2
• BetterFps Version: 1.4.8
• Forge/LiteLoader Version (if any): .2749
• Crash Logs (if any):

• Other Mods (if any): https://minecraft.curseforge.com/projects/smartcraft

[Peach774]

To be clear, the effect shows up, it just only makes the sky black. it doesnt limit player vision.