[x6herbius]

The spawn point limit I set in the code is 64, though that's arbitrary and independent of the entity limit in source (and is also far lower, which suggests entities might be being created by the plugin but not killed again afterwards).

What I've done for now is put together a quick hotfix which contains the basic functionality only (to function with any spawn point files you currently have) while I work on re-implementing the more complex stuff which has potential to go wrong, like creating and modifying the files themselves. The untested file is attached to the bottom of this post (though it's simple and should work), and I'm about to start up a temporary local server to test it properly.