Versions

Minecraft 1.12.2
Scaling Health 1.3.42
Silent Lib 3.0.13
Forge 4.23.5.2855
Optifine Installed No

Expected Behavior

With the below settings Mobs should take more than 1 damage per fire tick from being in daylight ie on fire when difficulty is 10000
Settings in Player>Damage>

• Affect Hostile Mobs "True"
• Affect Passive Mobs "False"
• Difficulty Weight "0.04"
• Generic Scale "1.0"
• Scale By Source "...[onFire 100]..."
• Scaling Mode "PLAYER_DIFFICULTY"

Actual Behavior

Mobs still only take 1 damage per tick of fire damage when difficulty is 10000

(Description here)
When high difficulty mobs spawn they stay alive for a ridiculously long time in daylight. Longer than a minecraft day. They need to die in daylight to free up resources.

To reproduce

Force a zombie to spawn with a high difficulty with the above settings. Observe it taking daytime damage but not dying.