Extension methods and tuples don't mash

[Katrix]

minimized code

object Bug {

  def (ab: (A, B)) pipe2[A, B, Z](f: (A, B) => Z): Z = f(ab._1, ab._2)

  def (a: A) leftErr[A, B](b: B): A = (a, b).pipe2((a, b) => a) //Doesn't compile
  def (a: A) leftOk1[A, B](b: B): A = Tuple2(a, b).pipe2((a, b) => a) //Compiles
  def (a: A) leftOk2[A, B](b: B): A = {
    val t = (a, b)
    t.pipe2((a, b) => a) //Compiles
  }
}

Error:

[error] -- [E007] Type Mismatch Error: D:\DevProjects\Incubating\Squeal\squeal\src\main\scala\squeal\TupleBug.scala:7:50
[error] 7 |  def (a: A) leftErr[A, B](b: B): A = (a, b).pipe2((a, b) => a)
[error]   |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^
[error]   |                                      Found:    Any
[error]   |                                      Required: A

expectation

I would expect that all three would work. In most cases I can inline a val without any types without changing the behavior of the program.