eunjoo Thanks for sending the Unity package! It turns out that the problem still seems to be caused by a misconfigured render pipeline.
Here is the image when I use the Example 2D URP Asset that comes with the URP extension package, which is for URP 2D Renderer:
Here is the image when I use the Example URP Asset that comes with the URP extension package, which is for URP 3D Forward Renderer:
Please check and look at our examples carefully. Just in case you need to know how to import the examples, select Spine Universal RP Shaders in the Package Manager, expand the "Samples" column and click the Import button (In the screenshot below, it's changed to Reimport, but if you haven't imported it yet, it should be Import.):
