Very nice of the author to clearify what a hole looks like, I needed to know.

Jokes aside quite a nice addition to P^2 if your players want to hide their creations or if you are running a contest.

This plugin is great and usefully e.g. if you have a combative build concept. It adds a "hide" flag to the plot-system. If the user have a wrong client version, in some cases he will get problems in these plots, because sometimes minecraft have problems with the modified client packages. But I think this is not a problem of this plugin, and you can communicate this with your user or prevent this with your network setup.

Fix the plugin:
If the plot is not a exactly chunk sized it will not work. If a player merge two chunks it goes really shit. Also need players to disconnect for hide the chunk. Fix or delete this plugin (also update the download file).