无法加载Cesiumlab的3DTiles服务

Cesium加载该服务正常；但是mtk加载时无法显示数据，通过观察页面请求发现只加载了一个b3dm文件，tileset.json文件在附件中

[test-tileset.json](https://github.com/user-attachments/files/21910142/test-tileset.json)

Start by reproducing the loading failure with the attached test-tileset.json and compare the Cesium and maptalks network requests. Trace the 3DTiles loading entry point to determine why only one b3dm file is requested; done means the complete service loads and its data is visible.

Written by the indexing model from the issue text.