React.Suspense doesn't take a non null fallback, used for a React Three Fiber model

Question

If I set a non-null fallback to React.Suspense, the screen goes white, but if I let it as null, nothing bad happens

This code goes white (when it finishes loading the model):

Component ShowModel.js:

    const LazyModel = React.lazy(() => import("./Model"))

    return (
        <Canvas
            style={{
                width: "100%",
                height: "100%",
                backgroundColor: "black",
            }}
        >
            <ambientLight intensity={0.4} />
            <directionalLight
                intensity={2}
                color="white"
                position={[0, 2, 4]}
            />
            <Suspense fallback={<h1>Still Loading…</h1>}>
                <LazyModel />
            </Suspense>
        </Canvas>
    )

But if I set

<Suspense fallback={null}>

nothing bad happens

I also tried with @loadable/component, but it went white also

What could it be?

Thanks in advance