Use NBT data to store the ID array. Initialize when the item spawns. Intercept the ItemCraftedEvent, merge the ingredient arrays, and write to the craft result.
Neoforge is not the same as Forge, you would probably get better results asking for help wherever Neoforge support is given.
Also, single player games are essentially local multiplayer games, there's a client and a server running, just both on the same computer. That's why the "open to LAN" button works.
Always post full logs when asking for support (that doesn't change between Forge/Neoforge, or anything for that matter), they likely contain information that would help determine the issue, even if you don't recognize the usefulness of it.
When i try to open minecraft with mods on versions above 1.16.5 there is a exit code -1 and is written that happened crash in Java virtual machine native code. If someone knows how to fix it, pls help
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