Actually implement mod code into server

common/inventory.ts

@@ -49,7 +49,7 @@ export class ContainerSlot {
 	#item_stack: ItemStack | undefined;
 
 	has_item() {
-		return this.#item_stack !== undefined;
+		return this.get_item() !== undefined;
 	}
 
 	set_item(item_stack: ItemStack | undefined) {
@@ -60,11 +60,15 @@ export class ContainerSlot {
 	}
 
 	get_item() {
+		// scripts can count a stack down to nothing, it's gone then
+		if (this.#item_stack && this.#item_stack.amount <= 0) {
+			this.#item_stack = undefined;
+		}
 		return this.#item_stack;
 	}
 
 	get type_id() {
-		return this.#item_stack?.type_id;
+		return this.get_item()?.type_id;
 	}
 
 	set amount(new_amount: number) {
@@ -77,11 +81,11 @@ export class ContainerSlot {
 	}
 
 	get amount(): number | undefined {
-		return this.#item_stack?.amount;
+		return this.get_item()?.amount;
 	}
 
 	get max_amount() {
-		return this.#item_stack?.max_amount;
+		return this.get_item()?.max_amount;
 	}
 }