The picture shows examples of normal and crumpled geometry.
When importing FBX with animation length 120 frames - there is a bug
Then the FBX with length of the animation 60 frames - no bug
But with different animations it shows differently, with a static model without animation everything is ok.
Reducing the size of the model (scene) 100 times did not help.
Maybe this is not a bug, but with other models this was not.
https://sketchfab.com/models/b24471222511413aac60f76f964183f7 (published with bug)
https://sketchfab.com/models/6817ed76a98747ae9960a0739cfbbbaa (draft without bug)