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WanderererRemover doesn't have a package in your API project. Put it inside the correct package
There's no bug. It's a wiki page that links to files someone deleted. Feel free to recreate the wiki content yourself.
This is SpigotMC, we recommend Spigot
It's the same thing
You can eg make a chunk snapshot and look at that async
I've fixed them, thanks
Your code is pretty broken (abstract class, static)
Suggest you learn a bit more Java (see point #1 about static...
Please stop adding useless +1 comments, there are reactions for a reason