I have a custom content entity list which has its own tab into admin/content/my_entity. The content of this tab is generated by using EntityListBuilder class. Actually, I created it with the drupal console. Now I am trying to add two more subtabs in this way:
entity.my_entity.collection: title: 'My entities' route_name: entity.my_entity.collection description: 'List of my entities' parent: system.admin_content weight: 0
entity.my_entity.list: route_name: entity.my_entity.collection base_route: system.admin_content title: 'List of my entities' weight: 10 entity.my_entity.list_tab_default: route_name: entity.my_entity.collection parent_id: entity.my_entity.collection title: 'Property 1' entity.my_entity.list_tab_two: route_name: entity.my_entity.collection_two parent_id: entity.my_entity.collection title: 'Property 2'
However, I can't get them to display under the parent's tab. Only parent tab is visible. Also, I tried to add these subtabs with the view and I could not make it displayed either. What I am doing wrong here?