[wp-trac] [WordPress Trac] #57546: Appearance>Menus Disappear (actual menu items) When Updating to WP 6+

[WordPress Trac]

#57546: Appearance>Menus Disappear (actual menu items) When Updating to WP 6+
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 Reporter:  truebird      |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Menus         |     Version:  6.1.1
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by Marpan):

 Hello,

 I have same issue as @truebird

 Single site install (I have other sites (2) not in a network that have
 same issues)

 Disabled all plugins except Woocommerce, maintenance mode and Flatsome
 theme as when I do that Appearance/menus disappeared. Tried with disabling
 everything still issues persist.

 Created a staging website, Debug is ON, can give access to the website to
 try to replicate issues.
 If needed can give access to FTP to do a manual downgrade to 5.9.5. after
 updating to new WP core version to test. Contact me.

 Before, after updating, I also had the issue that when I add one item to
 the menu and save, others appear, but disappear after some time.

 I don't have any menu plugins installed, tried disabling all the plugins
 and themes, then manual update WP core and still menus are missing until I
 revert to 5.9.5

 I also couldn’t figure why the menus were deleting again, tried running
 every cron job manually to try to trigger the delete, but nothing worked.

 Flatsome theme (premium) support responded to my request if this has
 anything to do with their theme:
 "We have seen a few other customers with the same issue. Would you please
 roll back the WP Core and see if the issue is resolved?"
 After rolling to 5.9.5 all issues are resolved and menus appear.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57546#comment:1>
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