TweakMode defaults numeric class variables to 0

[KevinWorkman]

Talking about this code:

MyClass myClass = new MyClass();

void setup() {
  size(100, 100);
}

void draw() {
  background(0);
  text(myClass.x, 50, 25);
  text(myClass.y, 50, 50);
  text(myClass.z, 50, 75);
}

class MyClass {
  int x = 123;
  float y = 123.0;
  String z = "testing";
}

If I run that using the plain old play button, I see this:

However, if I run using Tweak Mode, I see this:

It looks like Tweak Mode is defaulting numeric variables to 0 instead of the values given to them in the code. Is Tweak Mode expected to work with classes?

Note that I know that tweaking the values shouldn't do anything, but I would also expect their default values to be preserved.

This was originally reported on the Processing forum here.