Warning: message displayed when navigation item not found.

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When I exported the header template part, which includes a navigation menu I received the following warning for each menu item that was invalid.

Warning: Attempt to read property "post_status" on null in C:\apache\htdocs\wp55\wp-content\plugins\gutenberg\build\block-library\blocks\navigation-link.php on line 114

 <!-- wp:navigation-link {"label":"Home","type":"page","id":2,"url":"https://s.b/wp55/thisis/"} /-->

Actual output

Menu items unusable, except for Home, which links to the original site.

Expected output

• Menu items should have adjusted the URL to the site's permalink
  

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Possible explanation

• The message is produced for each Navigation link that has an invalid ID and has "type":"post" or "type":"page"
• Possibly twice per link.

Workaround

• Remove the "id" and "page" attribute from the navigation-link blocks.
• Remove the "URL" attribute as well, otherwise the links will go to the wrong place.

Proposed solution

• Fix the Gutenberg code in error.