Known Issues - mahjerion/Craft-to-Exile-Harmony GitHub Wiki

Unfortunately, healing allies at the moment does not work.
The HQM quest book party function is slightly broken - you can't disband your party without going into the config files, and rewards are kinda messed up.
LAN play doesn't work properly. Use a dedicated server - you can still play locally this way.
Cursed Spawners stop functioning if you leave the premise or die. They cannot be fixed. So uh, don't die.
The game may fail to start if playing on a Mac. Remove the FancyMenu mod.
Creating a new singleplayer world often results in a crash. To resolve this issue, go into your modpack folder, then your saves folder, then find the new world you just created. Delete the "hqm" folder, then boot up the modpack and try joining the world again. This should fix it.