Product Version = NetBeans IDE 8.2 (Build 201609300101)
Operating System = Linux version 4.4.0-47-generic running on amd64
Java; VM; Vendor = 1.8.0_101
Runtime = Java HotSpot(TM) 64-Bit Server VM 25.101-b13

Reproducibility: Happens every time

STEPS:
Create Javascript File:
~~~
class C3 {
  constructor (title)
  {
    this.title = title;
    this.classname = "class C3";
  }
}

var c = new C3('I am c');
var d = new C3('I am d');
console.log("typeof c: " + typeof c);
console.log("typeof d: " + typeof d);
~~~

If you debug this file and look into Window->Debugging->Variables, c is shown as function, d is show as object.
If you add them to a watch, they are shown correct inside watch (both as objects).

EXPECTED:
Both variables shown as type object.