TSL: Fix optional `Fn` parameters (#30884)

src/nodes/core/NodeBuilder.js

@@ -2710,6 +2710,11 @@ class NodeBuilder {
 
 	}
 
+	/**
+	 * Prevents the node builder from being used as an iterable in TSL.Fn(), avoiding potential runtime errors.
+	 */
+	*[ Symbol.iterator ]() { }
+
 	// Deprecated
 
 	/**
@@ -2725,6 +2730,7 @@ class NodeBuilder {
 
 	}
 
+
 }
 
 export default NodeBuilder;