Comment entity_id field doesn't set entityreference properties

Problem/Motivation

In Comment::baseFieldDefinitions()

    $fields['entity_id'] = BaseFieldDefinition::create('entity_reference')
      ->setLabel(t('Entity ID'))
      ->setDescription(t('The ID of the entity of which this comment is a reply.'))
      ->setRequired(TRUE);

See there is no ->setSetting('target_type', '??') because it is set when the comment bundle(CommentType) is defined in Comment::bundleFieldDefinitions()

    if ($comment_type = CommentType::load($bundle)) {
      $fields['entity_id'] = clone $base_field_definitions['entity_id'];
      $fields['entity_id']->setSetting('target_type', $comment_type->getTargetEntityTypeId());
      return $fields;
    }

Because of this when comment is created $comment = Comment::create([]); the target_type setting for entity_id field is not set.
This makes rendering of $comment->entity_id impossible using ER formatter.

Proposed resolution

Don't know yet

Remaining tasks

Don't know yet

User interface changes

None

API changes

None

Data model changes

Don't know yet