The current implementation (v0.2.4-SNAPSHOT) has issues setting the contents of chests properly.
All chests are empty after they are being generated.

No error or warning is returned regarding this issue when running the plugin.
Even though the proper functions are invoked.

This issue is discussed here:
https://www.spigotmc.org/threads/having-trouble-setting-chest-contents.270476/

This issue must be fixed before a new version can be released.