Reports a conflict even if all plugins deactivated and returned to default theme

  • I get the error message:

    If Menu detected that another plugin or theme (Walker_Nav_Menu_Edit) extends menu items incorrectly. This may cause duplicate visibility rules to show up, but functionality should be fine.

    Even if I de-activate all plugins and switch to the default Twenty Twenty-one theme this message is still there. Any idea what might be causing this?

    P.S. Also see here: https://wordpress.stackexchange.com/q/383497

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