When instanceof as a type comparison operator is used without any patterns in the current compilation unit, desugaring is skipped.

Sample 1:

import java.util.List;

public class Test {
      
    public static void main(String argv[]) {
            List<Short> ls = List.of((short) 42);
            System.out.println(ls.get(0) instanceof int);
            //System.out.println(ls.get(0) instanceof int p);       
    }
}

output:
false

Sample 2:

import java.util.List;

public class Test {
      
    public static void main(String argv[]) {
            List<Short> ls = List.of((short) 42);
            System.out.println(ls.get(0) instanceof int);
            System.out.println(ls.get(0) instanceof int p);       
    }
}

Output:
true
true