MixinDedicatedServer

The plugin gate: a hybrid server loads and enables its plugins inside this method, so from its RETURN a mod host's plugin classpath is finally complete. Everything else — vanilla, a plain mod server — fires it too and finds the latch already open.

Not MinecraftServer.loadLevel, which is nearer the plugin enable but which CraftBukkit gives a String parameter: the refmap pins the descriptor the AP resolved, so a selector written against vanilla stops matching there. This signature no hybrid touches.