Working regex fails when using Scala pattern matching

In a following code the same pattern matches when Java API is used, but not when using Scala pattern matching.

import java.util.regex.Pattern

object Main extends App {
  val text = "/oAuth.html?state=abcde&code=hfjksdhfrufhjjfkdjfkds"

  val statePatternString = """\/.*\?.*state=([^&\?]*)"""
  val statePattern = statePatternString.r
  val statePatternJ = Pattern.compile(statePatternString)

  val sj = statePatternJ.matcher(text)
  val sjMatch = if (sj.find()) sj.group(1) else ""
  println(s"Java match $sjMatch")

  val ss = statePattern.unapplySeq(text)
  println(s"Scala unapplySeq $ss")
  val sm = statePattern.findFirstIn(text)
  println(s"Scala findFirstIn $sm")

  text match {
    case statePattern(s) =>
      println(s"Scala matching $s")
    case _ =>
      println("Scala not matching")
  }

}

The app output is:

Java match abcde

Scala unapplySeq None

Scala findFirstIn Some(/oAuth.html?state=abcde)

Scala not matching

When using the extractor syntax val statePattern(se) = text the error is scala.MatchError.

What is causing the Scala regex unapplySeq to fail?