Attribute modifiers are completely broken

All Attribute modifiers for items do not work. 

I am working on a project a needs this feature to work. 

Mobs with extra health default to their normal health pool. 

Swords that are meant to do extra damage do only 1 attack damage

Modded armor does nothing. 

Please fix this when you have the time. This bug makes my project unplayable for the time being.