In fact, mixin plugins can be considered as coremods which are loaded in a different way than for normal plugins, that’s why they can’t be in the plugins/ folder.
A new version has been released for AntiXray, it is available for download here.
Would you mind to document the config of all the modifiers? I mean it’s nice that they generate what they need when you add them, but iot requires a restart and can be quite tedious…
I’m working on the documention, it will be available soon. I’ve not tested but instead of restarting the server, reloading (unload then load again using a world manager) a specific world should reload his configuration.
The latest version should fix the issue in your screenshot. You just have to break and place again few blocks around your ores to update the area.