Crashlog: https://gist.github.com/DaedalusGame/81d24150ea597a8d08a4d3eeaa100377
You're handling this with https://github.com/c0d3break3r/Omni/blob/main/src/main/java/pugz/omni/core/module/WintertimeModule.java#L31 but it crashes anyway, so I don't really understand. I tried disabling this config to test if it fixes a longer standing watchdog crash we're getting on the server that always seems to reference EntityJoinEvent

btw, i'm not sure entity join is a good event for this. There used to be an entity spawn event for this kind of purpose, no idea if it still exists, but if entity join works as it did, any entity join, including being read from nbt will trigger your stray spawning.