Blender exported GLTF with instances breaks Renderer's frustumCull

[monolithMktg]

When working with a Blender exported GLTF containing instances, trying to set frustumCull: false in

     this.renderer.render({ 
        scene: this.scene, 
        camera: this.camera,
        frustumCull: false
       });

throws the error that this.frustum is undefined at line 131 in Camera class.

The problem occurs whether you use Blender's Alt + D duplicates or Geo Nodes instancing. I enable Geometry Nodes Instances in Scene Graph options when exporting and they work well . Only setting frustumCull: false is buggy.

Blender File