Issue #2381909 by larowlan, alexpott: Basic block type provided by standard is missing a body field

core/profiles/standard/config/install/core.entity_form_display.block_content.basic.default.yml

+langcode: en
+status: true
+dependencies:
+  config:
+    - block_content.type.basic
+    - field.field.block_content.basic.body
+  module:
+    - text
+id: block_content.basic.default
+targetEntityType: block_content
+bundle: basic
+mode: default
+content:
+  info:
+    type: string_textfield
+    weight: -5
+    settings:
+      size: 60
+      placeholder: ''
+    third_party_settings: {  }
+  body:
+    type: text_textarea_with_summary
+    weight: -4
+    settings:
+      rows: 9
+      summary_rows: 3
+      placeholder: ''
+    third_party_settings: {  }
+hidden: {  }
+third_party_settings: {  }

core/profiles/standard/config/install/core.entity_view_display.block_content.basic.default.yml

+langcode: en
+status: true
+dependencies:
+  config:
+    - block_content.type.basic
+    - field.field.block_content.basic.body
+  module:
+    - text
+id: block_content.basic.default
+label: null
+targetEntityType: block_content
+bundle: basic
+mode: default
+content:
+  body:
+    label: hidden
+    type: text_default
+    weight: 0
+    settings: {  }
+    third_party_settings: {  }
+hidden: {  }
+third_party_settings: {  }

core/profiles/standard/config/install/field.field.block_content.basic.body.yml

+langcode: en
+status: true
+dependencies:
+  config:
+    - block_content.type.basic
+    - field.storage.block_content.body
+  module:
+    - text
+id: block_content.basic.body
+field_name: body
+entity_type: block_content
+bundle: basic
+label: Body
+description: ''
+required: false
+translatable: true
+default_value: {  }
+default_value_callback: ''
+settings:
+  display_summary: false
+third_party_settings: {  }
+field_type: text_with_summary

core/profiles/standard/src/Tests/StandardTest.php

@@ -90,6 +90,10 @@ function testStandard() {
     $this->assertText('Foobar');
     $this->assertNoText('Then she picked out two somebodies, Sally and me');
 
+    // Ensure block body exists.
+    $this->drupalGet('block/add');
+    $this->assertFieldByName('body[0][value]');
+
     // Now we have all configuration imported, test all of them for schema
     // conformance. Ensures all imported default configuration is valid when
     // standard profile modules are enabled.