AutoPlugin not overriding

Build.scala

import sbt._
import sbt.Keys._

object MyPlugin extends AutoPlugin {
  override lazy val projectSettings: Seq[Setting[_]] = Seq(
    resourceDirectory in Compile  := file("/tmp")
  )
}

object MyBuild extends Build {
  lazy val myProject = Project("my-project", file("my-project")).enablePlugins(MyPlugin)
  lazy val root = Project("root", file(".")).aggregate(myProject)
}