AnyVal value in a Selectable container class is stripped of its wrapper

[soronpo]

Compiler version

v3.1.1-RC2

Minimized code

https://scastie.scala-lang.org/l6Js266rRd2FuA4p0SkJLA

class Foo(val value : Int) extends AnyVal
class Container extends reflect.Selectable
val cont = new Container:
  val foo = new Foo(1)

println(cont.foo.value) //ClassCastException

Output

java.lang.ClassCastException: class java.lang.Integer cannot be cast to class Playground$Foo (java.lang.Integer is in module java.base of loader 'bootstrap'; Playground$Foo is in unnamed module of loader sbt.internal.BottomClassLoader @433c2ab9)
	at Playground$.<clinit>(main.scala:8)
	at Main$.<clinit>(main.scala:12)
	at Main.main(main.scala)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at sbt.Run.invokeMain(Run.scala:133)
	at sbt.Run.execute$1(Run.scala:82)
	at sbt.Run.$anonfun$runWithLoader$5(Run.scala:110)
	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
	at sbt.util.InterfaceUtil$$anon$1.get(InterfaceUtil.scala:17)
	at sbt.TrapExit$App.run(TrapExit.scala:258)
	at java.base/java.lang.Thread.run(Thread.java:831)

Expectation

No error.

[bishabosha]

related #4528