Dropdown getting stuck on iOS 9

I’m having trouble getting the dropdown working on iOS native. It works just fine in the browser and on Android.

When I click on a dropdown select and select the option, the menu does not go away and the item is not selected.
Relevant code:
<select ng-model="book" ng-options="book.book for book in books track by book.id"></select>
Seems very similar to this issue:

but this did not work for me.

I also found this stackoverflow post but there has not been any answers for it:

Please help!