Animations on Treeview indicators not working correctly

[Creaperdown]

Hey, I created a simple TreeView, but I am experiencing a weird behavior when trying to add a rotation animation to the indicator, my code looks like this: code which is pretty close to the tutorial from the docs. But for some reason, other indicators rotate as well, when clicking on any indicator: video

I've created a small example, so you can easily reproduce my problem: github.gist

Thanks to any help in advance

Extra: I'm not sure if this information is of any help, but only the already expanded nodes are rotating if I click on another one, the non-expanded nodes work as they should