Union Bug in Slick

Main.scala

import scala.slick.driver.ExtendedProfile
import scala.slick.driver.H2Driver.simple._

import Database.threadLocalSession

abstract class Drinks(tableName: String) extends Table[(Long, Long)](tableName) {
  def pk = column[Long]("pk")
  def pkCup = column[Long]("pkCup")
  def * = pk ~ pkCup
}

object Coffees extends Drinks("Coffee")
object Teas extends Drinks("Tea")

object Main extends App {
  val q1 = for (coffee <- Coffees; tea <- Teas if coffee.pkCup === tea.pkCup)
    yield coffee.pk ~ coffee.pkCup

  val q2 = for (coffee <- Coffees; tea <- Teas if coffee.pkCup === tea.pkCup)
    yield tea.pk ~ tea.pkCup

  val q3 = q1 union q2

  Seq(q1, q2, q3) foreach (q => println(q.selectStatement))
}

Fails to correctly generate the "select" part of the second query within the union.