The "aggregator_feed" entity type does not exist.

Problem/Motivation

I get this error when I delete fields from entities in Drupal 10.

Drupal\Component\Plugin\Exception\PluginNotFoundException: The "aggregator_feed" entity type does not exist. in Drupal\Core\Entity\EntityTypeManager->getDefinition() (line 142 of core/lib/Drupal/Core/Entity/EntityTypeManager.php).

I uninstalled the module a good while ago and removed it using Composer. I suspect things were not properly removed from the database when this happened, but I really have no idea. I've tried reinstalling and enabling the module, but the error persists.

It's possible this module was installed when we used Drupal 9.

Steps to reproduce

Using Drupal 9 or 10 (?), install the module. Uninstall, then remove the module. Create a field in an entity type, then delete that field. This is when I see the error.