It is not a bug. IF you use the basic menu module output it will work. You use the version 2 module, as stated in this thread to give you more control. When V2 came out, and is still a choice for lots of designers XHTML was the thing and compliance to strive for. Target is not a valid XHTML attribute and while it is in HTML5 a lot of developers and designers prefer to use other options to achieve this. You can have one line of code for example to cover every external url automatically to open in a new window.
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