Reported by ImKatsun

The Curios slot is not shown when the curiosAddHeadSlot option is enabled in the serverconfig directory AND NOT in the defaultconfig directory.

C4 (Curios developer) answered to my question, if there is another way to register slots than eith an imc

"I am working on an alternate way to register slots, but that's still a work-in-progress. Right now, modders do need to register their slots in that event. Is there a particular reason you need that config option server-side only?"

I should readd a common config file for this option until another possibility is added. :)