We're sorry to hear you're having troubles.
I'm using Unity 2022 and no URP in the project and still seeing how the previews are broken everytime I reexport a spine to unity.
We are not aware of such an issue yet (otherwise it would be an issue ticket on our roadmap), and we could unfortunately also not reproduce this issue by re-exporting the same skeleton, copying the exported assets over the existing assets in the Unity project while having the same AnimationReferenceAsset active in the inspector.
Have you reported such a problem before, since you are saying you are still seeing broken previews? We apologize if you missed your previous report, if so, could you let us know where this was reported before? If this was not reported before, could you please describe how to reproduce this issue? Which version of the spine-unity runtime (name of the unitypackage, also listed in Assets/Spine/version.txt) are you using?
From your screenshots I assume that you mean that the previews of the AnimationClip assets that are generated below ReferenceAssets, and not the AnimationClip assets below the generated Mecanim controller, is this correct?
