After JDK-8325679 (Optimize ArrayList subList sort), sequentially creating two sublists from an arraylist and then sorting both of them fails with a CME.

The review for JDK-8325679 mentions 'this doesn't change observable behaviour'. Since it appears to have changed observable behaviour, could this be backed out, and re-done with a CSR if the behaviour change ends up being necessary?

import java.util.ArrayList;
import java.util.List;
import java.util.Collections;
class T {
  public static void main(String[] args) {
    List<Integer> l = new ArrayList<>(List.of(1, 2, 3, 4));
    var a = l.subList(0, 2);
    var b = l.subList(2, 4);
    Collections.sort(a);
    Collections.sort(b);
    System.err.println(l);
  }
}

With openjdk full version "24-ea+13-1421"

java T.java
[1, 2, 3, 4]

With openjdk full version "24-ea+14-1523"

Exception in thread "main" java.util.ConcurrentModificationException
        at java.base/java.util.ArrayList$SubList.checkForComodification(ArrayList.java:1498)
        at java.base/java.util.ArrayList$SubList.sort(ArrayList.java:1588)
        at java.base/java.util.Collections.sort(Collections.java:145)
        at T.main(T.java:10)