Menu item translation attributes are shared

I just discovered that the Attributes section’s values are shared among a menu item for all of its translations.

Path in CMS: Home | Administration | Structure | Menus | Item | 59 | Edit menu | link

I started with English for a menu item.  If I try to make the EN have the Class value of “abcdef”, it then shows that class for ES.  If I remove it from ES, it disappears from EN.  I need it to be different for the two translations of the one menu item.

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