Regression: accessing a private method through a type variable

[Remi Forax]

Hello,
There is a regression in recent versions of javac.
javac 21 allows to access a private method through a type variable, here T::asString.

public class TDotToString {
  class Bar() {
    private String asString() {
      return "bar";
    }
  }

  static <T extends Bar> String foo(List<T> list) {
    return list.stream().map(T::asString).collect(Collectors.joining());
  }
}

Both IntelliJ and Eclipse emit an error in this case.

And javac 8 emits
  TDotToString.java:12: error: invalid method reference
    return list.stream().map(T::asString).collect(Collectors.joining());
                             ^
  cannot find symbol
    symbol:   method asString()
    location: bound of type variable T
  where T is a type-variable:
    T extends TDotToString.Bar declared in method <T>foo(List<T>)
1 error

regards,
Rémi