[wp-trac] [WordPress Trac] #57169: Prevent saving of invalid menu_item_parent

[WordPress Trac]

#57169: Prevent saving of invalid menu_item_parent
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 Reporter:  azaozz        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  6.1.2
Component:  Menus         |    Version:  6.1
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Follow up to #56926.

 There seems to be a bug in the Customizer that may set
 `$menu_item->menu_item_parent` to be the same as `$menu_item->ID`. Steps
 to reproduce: https://core.trac.wordpress.org/ticket/56926#comment:21.

 Seems there should be some validation of the `menu_item_parent` before it
 is saved in the `_menu_item_menu_item_parent` meta.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57169>
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