angular-ui-tree expand on hover not working - angularjs

I'm using angular-ui-tree recently, and trying to use it's data-expand-on-hover function. Unfortunately it's not working for me, or I'm using it wrong (what's more likely).
Directive:
https://github.com/angular-ui-tree/angular-ui-tree
Example:
https://jsfiddle.net/476g23cL/1/
Here is the example I got from the documentation; it's the example in the examples folder.
Even following the step by step I couldn't get it to work. I search a lot about someone with a similar problem, but not found it.
If someone can help me to use this directive correcly, I appreciate.

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