only in patch2:
unchanged:
--- a/core/modules/forum/config/install/field.field.comment.comment_forum.comment_body.yml
+++ b/core/modules/forum/config/install/field.field.comment.comment_forum.comment_body.yml
@@ -16,5 +16,6 @@ required: true
 translatable: true
 default_value: {  }
 default_value_callback: ''
-settings: {  }
+settings:
+  allowed_formats: {  }
 field_type: text_long