Navmenu incorrectly removing items

[camiloclc]

One of my menus is filled with categories. If I create a tag with the same name as a category and then remove this tag, the menu item for the category is also removed.

Example:
1 - create a category called "Example" (optionally associate some posts with it)
2 - add category to a navmenu
3 - create a tag called "Example" (optionally associate some posts with it)
4 - remove tag

Now the category "Example" is no longer in the navmenu it was added to.

Same here, probably nav menu is using slugs which could lead to a conflict when using different taxonomies with the same slug same slug

Small observation (core guys would say if it is related or not).

In taxonomy.php term_id is used and in wp_term_taxonomy both categories and tags using same name are linked to the same term_id.

Edit: using t.name comparison here

Sounds like a duplicate of #5809.