Snow does not work in custom dimension, if a biome is cold enough for it snow in, weather wont work at all. Note that this only works if every biome is cold enough for snow, if it isnt, it will snow and weather will work, but if every biome is cold enough for snow in the dimension, it wont work. Here is a custom dimension showcasing it, go in and do /weather rain and see that it wont work.
MCreator issue tracker has been migrated to GitHub.
Existing tickets have been migrated to GitHub. Please open new tickets on the GitHub tracker instead. If you do not have a GitHub account, all feature requests and bug reports from forums are still considered and checked by the maintainers.