With the little bit of information given I would suspect there to be something wrong with the normals of the model or its export in general.
Is this a model you made or is it downloaded from somewhere? Did you further edit the model and export it again? Which format is the model?
Would be best for me to test myself. So if you can provide the capx or a link to the model please do so.
I have been observing this for a long time, especially with animated models. I downloaded this model and animated it using mixamo. Here is the link to the .capx https://disk.yandex.ru/d/fKS7S1Ne-F2KrA
Oh, I see. Skinned meshes don't behave correctly anymore when scaled inside Babylon.js.
It appears I can fix this by using a transform node instead of scaling the model directly. Which I'm looking to add to the next update planned for later this month.
If you want to circumvent the issue for the time being you can add "scene.skipFrustumClipping = true;" at around line 376 in the runtime.js file of the main plugin.
