@zf3d Sorry for the troubles and thanks for providing your version info up front, this helps a lot! The spine-unity and spine-csharp runtimes are caught up with the reference implementation, so this might likely be a bug. Spine Editor version 4.3.38 fixed a bug related to Slider animation paths and folders (see here), so perhaps something broke in this regard. Did you encounter this issue with the skeleton exported as .json, or as binary .skel.bytes? Please note that it might be only one export format which is adversely affected, while the other may be usable in the meantime.
Could you please send us a minimal Unity project which still shows this issue? You can send it as a zip file to contact@esotericsoftware.com, briefly mentioning this forum thread URL so that we know the context. The we can have a look at what's going wrong.
