JS output not quite right

[konsumer]

On website I get this for hearthstone tester:

{
  "f0": {
    "f1": [],
    "f9": [],
    "f5": []
  }
}

with mapping I can get more fields, but this should work out of the box.

In my tests, I get a much larger JSON object with this code:

console.log(JSON.stringify(appTree.toJS(), null, 2))

but tree gives me similar results, so I think it's not traversing into 1.2.4 correctly.