How can foreach be faster than loop?

I did some micro-benchmarks with foreach and while and to my surprise loop actually lost, though there is less difference with latest version of Scala. Here are the results (Azul JDK 11.0.12 running on M1)

Scala 2.13.6

Benchmark                     Mode  Cnt      Score     Error  Units
HashMapBenchmark.vectorMutable  thrpt   10  53220.300 ± 220.481  ops/s
HashMapBenchmark.whileMutable   thrpt   10  49586.007 ±  48.883  ops/s

Scala 2.12.15

Benchmark                     Mode  Cnt      Score     Error  Units
HashMapBenchmark.vectorMutable  thrpt   10  41298.593 ± 245.915  ops/s
HashMapBenchmark.whileMutable   thrpt   10  36607.998 ± 476.617  ops/s

Benchmark code

  case class Cookie(name: String, value: String)
  
  state.cookies = (1 to 1000).map(i => Cookie(s"name_$i", s"value_$i")).toVector

  @Benchmark
  def vectorMutable(state: BenchmarkState, blackhole: Blackhole): Unit = {
    val map = new mutable.HashMap[String, String]()
    state.cookies.foreach(c => map.put(c.name, c.value))
    blackhole.consume(map)
  }

  @Benchmark
  def whileMutable(state: BenchmarkState, blackhole: Blackhole): Unit = {
    val map = new mutable.HashMap[String, String]()
    var i = 0
    while (i < state.cookies.length) {
      val cookie = state.cookies(i)
      map.put(cookie.name, cookie.value)
      i+=1
    }
    blackhole.consume(map)
  }

How is it even possible?