He dances the ninja well with his arms sheet of paper 
Try adding this after creating the Babylon engine
BABYLON.SceneLoader.CleanBoneMatrixWeights = true;
How to set this in the editor?
I hadn’t realized it was for the editor. There is no parameter for this. Let’s wait for @julien-moreau to see what he thinks about it.
Some people would call it ‘Art’. Why do you want to constrain ‘procedural art’? : Just open your mind and let it in 
Just joking of course 
@Tidus while waiting for the serious answer from @julien-moreau …Hopefully to come soon 
Thx for your patience and meanwhile, have an awesome WE 
Hi @Tidus !
I’m so sorry I missed the post !
I have fixed this issue recently and it’s going to be released this week with the support of BabylonJS v5 in the editor
The issue was located in the FBX loader when computing bones. Pre rotation and post rotation were not applied on bones transformations