Minecraft: 1.12.2
Forge: 14.23.5.2854

Mods: 5
AppleCore-mc1.12.2-3.4.0
DynamicSurroundingsHuds-1.12.2-3.6.0.0
jei_1.12.2-4.15.0.291
OreLib-1.12.2-3.6.0.1
scalingfeast-1.5.3

Some potion icons from other mods will not render normally, unless you pause the game in which the invisible icons will render, as seen in the image below.

On the left these potion icons are invisible. On the right I have the game paused and the potion icons are no longer invisible but if I unpause they turn invisible.

These potion icons are from a mod called 'Scaling Feast' although other modded potion icons are effected as well.

I have the same issue. Really wish these would render!

Might be a mod conflicting. In a pack of 340+ mods that I have the potion icons load unless there's a mod that doesn't have a potion icon for that effect.

For me none of these new HUDs even render so. I'm very confused as to how this is working for you.