The same setup, but completely different results.
In version 5.7.2, using the configuration shown in the image, monsters could spawn anywhere. However, after upgrading to version 5.8, monsters cannot spawn normally in urban building areas no matter what. I tried adding conditions—such as onblock,onground and spawning when the lightlevel=<7—but none of them had any effect.Interestingly, in areas that haven't undergone extensive construction and remain relatively natural, monster spawning still works normally, just like in version 5.7.2.I checked the wiki on the RandomSpawn section, but I couldn't find any information related to the issue I'm experiencing.