Autoconverted glTF contains 50k+ validation warnings, does not display correctly in three.js

Hello! I tried downloading this Pigman model to load in three.js and it doesn’t load correctly. The glTF model loads a floating axe with a tiny Pigman inside and has 50k+ glTF validation warnings. It seems that there’s an issue with glTF conversion.

You can see the issue and warnings in this gltf viewer:

in three.js

in sketchfab