entity_submenu_block
The Entity Submenu Block provides a block that displays the current page's submenu items as rendered content entities (typically used in the “teaser” or similar view modes).
Requirements
This module requires no modules outside of Drupal core.
Installation
Install as you would normally install a contributed Drupal module. For further information, see Installing Drupal Modules.
Configuration
You can add Entity Submenu blocks at Structure → Block layout. For each block you can configure the view modes that should be used for displaying different content entity types.
By default only menu items are rendered for content entities, but you also have the option to enable the rendering of other menu items as simple links as well.
Development proudly sponsored by German Drupal Friends & Companies:
webks: websolutions kept simple (https://www.webks.de)
and
DROWL: Drupalbasierte Lösungen aus Ostwestfalen-Lippe (OWL), Germany (https://www.drowl.de)