Menu : submenus position problem with long text

jQuery UI v1.12.1 + jQuery v3.2.1

When the submenu entries texts are too long, the submenu is not positionned correctly.

Strangely, after a few attempts (always the same number), it is correctly positionned.

The menu is set up without any options :

$( function() {
	$( ".menu" ).menu();
});

Here is an example demonstrating the problem :

https://jsfiddle.net/tcharlss/ucr5bo7L/6/