Point styling not applied to GLB point clouds

This might be related to (or even be a duplicate of) https://github.com/CesiumGS/cesium/issues/11492

It has originally been brought up in https://github.com/CesiumGS/3d-tiles-tools/issues/67 , but I suspect that this is in fact only a rendering issue in CesiumJS.

The following archive contains two tilesets:

• one with a PNTS file with classification info in the batch table
• one with a GLB file that contains the same information, converted into the EXT_structural_metadata information

It also contains a sandcastle for quick tests. The sandcastle defines a style for the tileset, and it shows this behavior:

For the case of the PNTS file, the style (green points) is applied correctly.
For the case of the GLB, the style is not applied. All the points are black. (Only after hovering the content, with the 3D Tiles Inspector enabled, the style is applied).

The archive with the test files and the sandcastle:

ToolsIssue67.zip

Start with the linked ToolsIssue67.zip archive and its Sandcastle, comparing the PNTS and GLB tilesets described in the report. Reproduce the style behavior with and without hovering or the 3D Tiles Inspector; done means the GLB point cloud receives the defined style without requiring hover interaction.