OpenLayer: Extent of KML lost and turned to [Infinity, Infinity, -Infinity, -Infinity]?

I am trying to retrieve the extent of a KML layer I am bringing into OpenLayer.

When I open the KML layer in QGIS, I see there is extent information attached to it that I would like to use inside OpenLayer.

(Note: that extent information is "correct" => matches my expectations)

But when I load the layer in my script using VectorSource and format: new KML(), it seems as though the extent information is lost and turned into [Infinity, Infinity, -Infinity, -Infinity].

import VectorSource from "ol/source/Vector.js";
import KML from "ol/format/KML.js";

const model = new VectorSource({
      url: ".....",
      format: new KML(),
    });

console.log("model");
console.log(model);
console.log("model.getExtent()");
console.log(model.getExtent());

My question: Is there a way to programmatically retrieve the extent information I see in QGIS directly from within my OpenLayer script (by reading a property of the imported object rather than copy pasting manually from QGIS or some other data-source)?

To load the source you need to add it (in a layer) to a map

const model = new VectorSource({
      url: ".....",
      format: new KML(),
    });

model.once('featuresloadend', () => {
  console.log(model.getExtent());
});

map.addLayer(
  new VectorLayer({
    source: model,
  })
);

Alternatively fetch the url and read it with the KML format parser

const model = new VectorSource();

fetch( ".....")
  .then((response) => response.text())
  .then((text) => {
    model.addFeatures(
      new KML().readFeatures(text)
    );
    console.log(model.getExtent());
  });