?query_strings not recognised in custom menu items

Moodle 2.7.2
Site admin > Appearance > Themes > Theme settings > custom menu items

Having trouble adding a menu item that includes a query string.
The target="_blank" attribute is working for all the URLs except the last one.
The only difference seems to be the query string in the URL (id=7246).
All URLs open in a new tab (Chrome) except for the last one, which opens in the same tab.

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