Babylon.js GaussianSplattingMesh addPart Method Not Displaying Splat Models

[pengzhen85]

How to use the addPart method of GaussianSplattingMesh to display chunked Gaussian splat models? My code is as follows, and I found that the splat does not display after running. What could be the reason? Here is the code:
const splat = new BABYLON.GaussianSplattingMesh("GS", null, scene, true);
// Load sub-objects
let subs = ["17_107839_36240 (1).spz", "17_107839_36240 (2).spz", "17_107839_36240 (3).spz"];
for (let sub of subs) {
let partGs = new BABYLON.GaussianSplattingMesh("partGs" + i, null, scene, true);
await partGs.loadFileAsync("./output/" + sub);
splat.addPart(partGs, false);
}
splat.parent = root;
splat.position.set(0, 0, 0);
splat.scaling.set(1, -1, 1);
splat.rotation = new BABYLON.Vector3(0, 0, 0);