it's not my theory, it's from the help file ;-)
Seems that it is really not working as described, eg. when I double click on the item that has expanded children, it won't collapse them (in the case when "single click expand" option is selected)
But in your case, there is nothing to expand when you double-click on that item as it has no children. But I understand exactly what you mean ... it would need some distinction in the operation of double-click in the data explorer ...
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