Updates to Booking Entity throws an Entity mismatch is Status page

Wow, that was annoying, it was upset about some revisionable stuff on "One Click Booking" and "In Progress Booking" fields on Bookable Calendar. This will be fixed in latest 2.2.x release, and after some testing I'll get that out in a full release soon.

Just for fun; If you ever have Entity Mismatch issues and using that module that auto updates them isn't an option (like having a contrib module), I think I FINALLY found a way to know why it's so sad.

Go to: core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php and add extra code and breakpoints in every protected method that checks diffs to find issues.
For me it was in here

if (
      $storage_definition->hasCustomStorage() != $original->hasCustomStorage() ||
      $storage_definition->getSchema() != $original->getSchema() ||
      $storage_definition->isRevisionable() != $original->isRevisionable() ||
      $table_mapping->allowsSharedTableStorage($storage_definition) != $table_mapping->allowsSharedTableStorage($original) ||
      $table_mapping->requiresDedicatedTableStorage($storage_definition) != $table_mapping->requiresDedicatedTableStorage($original)
    ) {
      return TRUE;
    }

Then when that was returning true I just ran every if myself to see which one it actually was mad about. Then after that I was able to fix it with a db update like this

function bookable_calendar_update_8202() {
  $entity_definition_update_manager = \Drupal::entityDefinitionUpdateManager();
  $field_storage_definition = $entity_definition_update_manager->getFieldStorageDefinition('book_in_progress', 'bookable_calendar');
  $field_storage_definition->setRevisionable(TRUE);
  $entity_definition_update_manager->updateFieldStorageDefinition($field_storage_definition);
}

That was hours and hours of pain.