Only one side of .wrl models gets rendered in ThreeJs

Question

I have a .wrl file that looks normal (image below) when opened in MeshLab or Microsoft 3D Builder. However when loaded with Threejs THREE.VRMLLoader only one side of it gets rendered. I'm using the sample code from the three.js developers site.

var loader = new THREE.VRMLLoader();
loader.load( filename, function ( object ) {

        scene.add( object );

});

model opened in MeshLab

model loaded in ThreeJs