This is a patch that seems to be working on our test servers. For anyone that wants it.     

The only issue that remains that I have not patched yet! is when your inventory is full it will kick you if you try and craft another car key.  But adding car locks and crafting keys all works just fine now from our testing. :) 

This is another attempt at patching the last error issue... ( Untested )

Moderator edit: Please do not post random versions of plugins in forum posts, thanks. For sharing suggested changes, please use code blocks and show the relevant changes.

//On line 550 something updates it to this to fix key/lock issues. 

        private void OnItemCraftFinished(ItemCraftTask task, Item item)
        {
            if (task.instanceData != null)  //Added this to replace the workaround I did... ( This = perm fix )
                item.instanceData = task.instanceData;
            if (task.owner.net.connection.authLevel == 0) return;
            var crafter = task.owner.inventory.crafting;
            if (crafter.queue.Count == 0) return;
            crafter.queue.First().endTime = 1f;
        }


//On line 663 something update it to this to fix msg issues...  was -1,    correct way is 2, 0,

private void SendChatMessage(BasePlayer player, string message, params object[] args) => player?.SendConsoleCommand("chat.add", 2, 0, string.Format($"<color={ChatPrefixColor}>{ChatPrefix}</color>: {message}", args), 1.0);

Dear admins pls don't delete this... I am posting just the edits this time... nothing more nothing less... 

khan

Dear admins pls don't delete this... I am posting just the edits this time... nothing more nothing less... 

This fix posted above does create issues between ZlevelsRemastered and CraftingController... Both use OnItemCraft.
The only option is to Gut out a section from ZlevelsRemastered or have craft levels disabled in config...