How to get featureId in EXT_mesh_features

CesiumJS
1

I have points cloud tileset(3D Tiles Next). There are two featureIds(Feature ID by Vertex) in each tile.
In Sandcastle, I can’t get the feaureId of the selected feature.
I can’t even get Cesium3DTileFeature. Picking result is something else.

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So how to get featureid? I want to use this id to get properties from database.
Thanks.

2

I also encountered the same problem. May I ask if you have resolved it?