I think there might be a bug with the Lit URP shader where occlusion does not seem to work on it at all. This only seems to be an issue on URP because the Occlusion Standard BiRP shader works fine on ...
On some configurations, Spine URP shaders have compile errors when used with Unity 6000.1 and URP 17.1. Cause is that internal version detection preprocessor logic in shaders does not set IS_URP_14_OR ...