I think you need to do:

set slot (slot) of player to (item) named "text"

Example:
set slot 22 of player to skull of player named "Cool Skull"

 

What addons do you use?

 

any errors?

 

Ok so, you want that when a player opens his inventory, his crafting slots are set to a specific item, am i right?

 

Mmh, i tried a lot of skripts but none of them worked as you asked. At this point i don't think there's anything you can do with skript... Sorry

 

Try

Code (Text):

1. set slot 0 of current inventory of player to dirt

Taken from https://forums.skunity.com/threads/inventory-crafting-slot.3215/

 

I tried it and it doesn't work, there are no errors but the slot doesn't set to the item

 

Does the player have their own inventory open when you try to set the slot? And by the way, to confirm what you said, yes it is possible to edit the crafting slots, Ive seen people do it, we just got to do a little more research.

 

Yes, I tried in all possible ways I could think of and none of them worked, even with packets, but no. The only thing I can think rn is using Javascript, idk sorry

 

Javascript...?