glTF models for Skinning has orientation problem

I tried the loading of some of gltf models by babyon.js.

https://cx20.github.io/gltf-test/

However, Orientation of some of glTF models for Skinning is incorrect.

For example,

https://cx20.github.io/gltf-test/examples/babylonjs/index.html?model=RiggedSimple&scale=0.2

https://cx20.github.io/gltf-test/examples/babylonjs/index.html?model=RiggedFigure&scale=1

https://cx20.github.io/gltf-test/examples/babylonjs/index.html?model=CesiumMan&scale=1

Please confirm whether there is a problem.