Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException: The "menu" entity type did not specify a storage handler. in Drupal\Core\Entity\EntityTypeManager->getHandler() (line 27

HI,

I'm getting a similar error in D9.5.7

Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException: The "menu" entity type did not specify a list_builder handler. in Drupal\Core\Entity\EntityTypeManager->getHandler() (line 256 of /var/www/vhosts/drupal9/core/lib/Drupal/Core/Entity/EntityTypeManager.php).

I'm also unable to edit the Admin menu - trying to reorder some of the parent items.

Eric

I'm getting the same error as #16 on Drupal 10.2.5
It goes away after invalidation Drupal cache a few times.
But it is indeed a fatal error, the site shows: "The website encountered an unexpected error. Please try again later."
All I did was open the site and try to go to a particular menu from the admin dashboard.

We experience this on 10.3.6.
/admin/structure/menu throws this strange fatal error.

$a = \Drupal::entityTypeManager()->getDefinition('menu');
print_r($a);

As you can see, the menu definition gets impartial, but it's not behaving the same way at every cache rebuild.
If there would be a faulty alter hook, I'd expect that it would kick in every time.

A cache clear may or may not fix it. The subsequent cache clear may break it again.

On this site, which is domain-enabled, high traffic site, it seems like a race condition. However I could reproduce it on a low-traffic non-live environment too, while trying to access admin pages during a cache clear.

We do not use Redis, APCU, only pure database backend for the bins.