Settings changing by themselves without autoconfig active (nametag going to true and spawn rate going to rare).
invisible baby husk.
Dreadful donation is not working (I tested with commands and mod mechanics and nothing worked).
Herobrine's eyes don't glow (probably because of other mods).
Herobrine trying to jump more than 2 blocks and getting stuck most of the time and others I forgot but will take a look at later! 
#Some small bugs:
pine comet
ornate hearth
invisible baby husk is to make you unable to sleep when "no-sleep" is enabled in the config