Low health VFX are different from old versions

[VoteableDuck]

Using the default configuration on both versions, I observed that in version 1.21.11, the low-health red vignette flash becomes fainter as health decreases and when it is 1.0hp, it literally looks like it disappered.

Minecraft.1.12.2.mp4

Minecraft.1.21.11-Neoforge-1.8.27.mp4

[VoteableDuck]

private float getIntensity(@NotNull Player player) {
        if (useHealthPercentage)
            return (maxHealthPercentage - (player.getHealth() / player.getMaxHealth()));
        return player.getHealth() / maxHealth;
    }

Perhaps you need to change this piece of code in HeartbeatHandler.

[CreativeMD]

Fixed in the newest version. Thanks for your detailed bug report and your suggestion on how to fix it. Helped a lot. Hope everything works now as expected.