I can see only normal log messages, but not a single log warning or log error message.
From the screenshots I can see that you selected the normal UniversalRP
Render Pipeline Asset. Did you modify this Render Pipeline Asset? If you haven't modified it (by assigned a 2D Renderer) then it's using the normal URP forward 3D renderer, which should display the URP/Spine/skeleton
shader normally. Are you sure you haven't accidentally assigned the Universal Render Pipeline/2D/Spine/skeleton
shader?
Which version of the Unity Universal RP
UPM package (not the Spine URP shaders package, Unity's RP shaders) are you using?