Bug: Cannot pre-select last option in Ionic Select

Here is the Codepen:

On the Codepen you will find two select boxes.
One with the second last option pre-selected and another one with the last option pre-selected.

The issue is that I cannot pre-select the last option in the drop down box.

Ionic version:
//code.ionicframework.com/nightly/js/ionic.bundle.js (In Codepen)