scalaのデシリアライズでエラーになる

scalaのシリアライズに関しての質問です。

以下のコードを scalac でコンパイルして scala コマンドで実行すると正常に実行できるのですが、
sbt から run すると java.lang.ArrayStoreException となってしまいます。
Arrayに対して不正な型を格納している部分は無いとの認識なのですが、なぜこのような挙動になってしまうのでしょうか。

scalaのバージョンは2.12.4、sbtのバージョンは1.1.0です。
OSはCentOS7です。

import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.nio.file.Paths;
import java.nio.file.Files;

case class Data(a: String, b: Int)
object Main {
  def main(args: Array[String]): Unit = {
    val arr: Array[List[Data]] = Array[List[Data]](List(Data("a", 97)))
    val path = Paths.get("SerializeSample.bin")
    // serialize
    val oos = new ObjectOutputStream(Files.newOutputStream(path))
    oos.writeObject(arr)
    oos.close()
    // deserialize
    val ois = new ObjectInputStream(Files.newInputStream(path))
    val ret = ois.readObject().asInstanceOf[Array[List[Data]]]
    ois.close()
    println(ret.mkString(" "))
  }
}

sbt:sbt> run
[info] Running Main
[error] (run-main-13) java.lang.ArrayStoreException: scala.collection.immutable.List$SerializationProxy
[error] java.lang.ArrayStoreException: scala.collection.immutable.List$SerializationProxy
[error]         at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1975)
[error]         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1567)
[error]         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:433)
[error]         at Main$.main(Main.scala:17)
[error]         at Main.main(Main.scala)
[error]         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error]         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error]         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error]         at java.lang.reflect.Method.invoke(Method.java:498)
[error]         at sbt.Run.invokeMain(Run.scala:93)
[error]         at sbt.Run.run0(Run.scala:87)
[error]         at sbt.Run.execute$1(Run.scala:65)
[error]         at sbt.Run.$anonfun$run$4(Run.scala:77)
[error]         at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error]         at sbt.util.InterfaceUtil$$anon$1.get(InterfaceUtil.scala:10)
[error]         at sbt.TrapExit$App.run(TrapExit.scala:252)
[error]         at java.lang.Thread.run(Thread.java:748)
[error] java.lang.RuntimeException: Nonzero exit code: 1
[error]         at sbt.Run$.executeTrapExit(Run.scala:124)
[error]         at sbt.Run.run(Run.scala:77)
[error]         at sbt.Defaults$.$anonfun$bgRunTask$5(Defaults.scala:1168)
[error]         at sbt.Defaults$.$anonfun$bgRunTask$5$adapted(Defaults.scala:1163)
[error]         at sbt.internal.BackgroundThreadPool.$anonfun$run$1(DefaultBackgroundJobService.scala:366)
[error]         at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error]         at scala.util.Try$.apply(Try.scala:209)
[error]         at sbt.internal.BackgroundThreadPool$BackgroundRunnable.run(DefaultBackgroundJobService.scala:289)
[error]         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[error]         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[error]         at java.lang.Thread.run(Thread.java:748)
[error] (Compile / run) Nonzero exit code: 1
[error] Total time: 0 s, completed 2018/02/04 15:59:19