Improper checkbox state icon using .checkboxradio() and .tabs()

I've some trouble to properly render a selected checkbox when put inside a tabs widget.

Outside the tabs the checkboxes renders correctly.

I prepared a JSFiddle showing the issue: https://jsfiddle.net/x30gzqo4/8/

The same issue has been discussed also in:

https://stackoverflow.com/questions/48286850/jquery-ui-improper-checkbox-state-icon-using-checkboxradio-and-tabs