i asked about this over discord, and you suggested that i open an issue about it

Fixed in latest releases
1.15: 1.0.31
1.16: 1.0.32
1.18: 1.0.12

This is technically both a bug and a suggestion as this was meant to happen at some point, but never did

I actually did start implementing this, it turns out I just didn't finish it

Does the item just go in there or is there some further usage I can test

to be honest i'm not quite sure what else it does, if anything
taking a glimpse at the code makes it seem that equipping the klein star in a curio slot just makes it work the same way it does in the inventory, just from the curio slot

in theory if they do anything else, that should be included as I've used ProjectE's capability

So I'm considering this as complete, and I'll probably get it into a release today