After using IK, the bone wiring is displayed incorrectly
example
Can you share your playground link?
There is a link in OP’s post (below the image :))
Oh shoot I’m blind thanks!
Now I see it, and it seems that it only happens with the Lines display which is a good clue
Also if the skeleton animation is stopped, the lines follow the movement perfectly Demo | Babylon.js Playground (babylonjs.com) might be some desynchronization between the IK and animation
Fix skeleton update cache by carolhmj · Pull Request #12695 · BabylonJS/Babylon.js (github.com) PR is up! Thanks for reporting this
good