When loading 3D Tiles data with CesiumJS v1.97.0 and higher versions, all textures are missing. However, when loading with v1.96.0 and earlier versions, the textures are rendered correctly without any loss.
Hi @xytczh,
There was a major refactor of how 3D Tiles are loaded that became the default in 1.97.
I would suggest opening a bug on the CesiumJS GitHub which additional details, such as a Sandcastle code example and the data which reproduces the issue.