Fatal error when creating an entity reference field listing Fields config entity

Problem/Motivation

When I create an entity reference field to "Field" config entity, I get this error:

Drupal\Core\Config\ConfigValueException: node.article.body key contains a dot which is not supported. in Drupal\Core\Config\ConfigBase->validateKeys() (line 211 of core/lib/Drupal/Core/Config/ConfigBase.php).

Steps to reproduce

1. Create a custom block type (/admin/structure/block/block-content/types/add)
2. Add a new field to the custom block type
2.1 Reference > Other
3. Select Field under Configuration
4. Change it to Unlimited (multivalue)
5. Reference method: Config filtered by specific fields
6. Select Body from Node Article (you need to inspect in order to figure that out) - See attached image
7. Click on save

Result:

Drupal\Core\Config\ConfigValueException: node.article.body key contains a dot which is not supported. in Drupal\Core\Config\ConfigBase->validateKeys() (line 211 of core/lib/Drupal/Core/Config/ConfigBase.php).