MomosArts Thank you for sending your Unity project! To be honest, I couldn't reproduce the issue itself because the steps provided were a bit vague. However, I did find what I believe is the likely cause, so I'd like you to check the following:
The cause of the problem is that your skeleton has multiple texture atlas pages and uses the SkeletonGraphic component, yet you haven't enabled Advanced - Multiple CanvasRenderers. Please first read the "Important Material Requirements” section of the spine-unity runtime documentation.
In your case, your skeleton has two texture atlas pages. The character textures fit entirely on the first page, but some VFX images are contained on the second texture atlas page. Therefore, animations without VFX played back correctly, while animations with VFX displayed a misalignment in the referenced region, resulting in the strange clipping effect you've been seeing.
The solution for encountering this issue is also explained in the video from 06:22 to 07:38:
