How to change normalMap repeat using NodeMaterial?

Trying to use NodeMaterials here to make my normalMap repeat pattern independent from the object map. The problem is, even only with a normal map attached to the object, I cannot make the repeat setting of the normalMap have any effect. What am I doing wrong? Here is my code:

          let objectMaterial = new Nodes.MeshStandardNodeMaterial();

          objectNormalMap = new THREE.TextureLoader().load("pattern.jpg");
          objectNormalMap.wrapS = objectNormalMap.wrapT = THREE.RepeatWrapping;
          objectNormalMap.repeat.set(12, 12); // <<------------- NO EFFECT

          objectMaterial.normalMap= new Nodes.TextureNode(objectNormalMap );

I’ve also tried the following without any changes to the result:

          objectMaterial.normalMap = new Nodes.NormalMapNode(
           new Nodes.TextureNode(objectNormalMap )

Could anyone help? I’ve been trying this for hours without any success.

Any ideas of how this could work?