RxScala vs Monix(3.0.0-RC2): behavior of SwitchMap when "parent" Observable completes

SwitchMap.scala

package example

import monix.execution.Ack

object Main {

  def main(args: Array[String]): Unit = {
    implicit val s = monix.execution.schedulers.TestScheduler()
    val parent = monix.reactive.subjects.PublishSubject[Int]()
    val child = monix.reactive.subjects.PublishSubject[Int]()

    val o = parent.switchMap(x => child.map(x -> _))

    o.subscribe{ u =>
      print(u)
      Ack.Continue
    }

    parent.onNext(1)
    child.onNext(1)

    parent.onComplete()
    child.onNext(2)
    // prints "(1, 1)" - in RxScala, this would print "(1,1)(1,2)"
  }

}