We are testing, similar to how it worked on previous versions of Alice, only permitting chunk loading via ChickenChunks. This is because ChickenChunks is the only mod that keeps track of who is loading the chunks. With other chunk loaders, they never ever unload chunks, so even if you haven't been on the server for four months, it would still degrade the server's performance for everyone else who is currently playing.
As of writing, ONLY chunks loaded by ChickenChunks will be loaded. We will be adjusting ChickenChunks accordingly.