Why eta-expansion of polymorphic method does not result in polymorphic function value?

Question

Scala 2 does not have polymorphic function values so eta-expanding polymorphic methods gives only

scala> def f[A](a: A): A = ???
def f[A](a: A): A

scala> f _
val res0: Nothing => Nothing = $Lambda$7757/1502613782@45af2c1

However Scala 3 does have polymorphic function values so why eta-expanding polymorphic methods does not give more than

scala> def f[A](a: A): A = ???
def f[A](a: A): A

scala> f
val res0: Any => Any = Lambda$7538/1430563609@4a905603

scala> val g: ([A] => A => A) = f
1 |val g: ([A] => A => A) = f
  |                         ^
  |                         Found:    Any => Any
  |                         Required: PolyFunction{apply: [A](x$1: A): A}