Some Unity developers had feedback to us that there are black pixels on one of the demo scenes after upgrading Forest Ruins Terrain Pack Cute Toon Series to URP.
The black pixels are caused by the cookie map on the light in the demo scene to create cloud shadow. For some reason, the cookie size is reset after upgrading to URP. It could be a bug. To resolve it, simply change the cookie size on the light inspector to a bigger number. For example 50 or 100. Or remove the cookie map.