Cannot add a "More like this" block is a view on my search index

I was following the instructions from 7 years ago (...) given here. When adding the block to the page it simply does not show. View results preview does not work with path either. The view is of my specific index. The chosen values are "Title" and "Latin first name" that are definitely indexed and used in other views successfully.

Following is the export of the view:

$view = new view();
$view->name = 'similar_data';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'search_api_index_partial_word_index';
$view->human_name = 'Similar data';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['use_more_always'] = FALSE;
$handler->display->display_options['access']['type'] = 'none';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'full';
$handler->display->display_options['style_plugin'] = 'default';
$handler->display->display_options['row_plugin'] = 'fields';
/* Header: Global: Text area */
$handler->display->display_options['header']['area']['id'] = 'area';
$handler->display->display_options['header']['area']['table'] = 'views';
$handler->display->display_options['header']['area']['field'] = 'area';
$handler->display->display_options['header']['area']['empty'] = TRUE;
$handler->display->display_options['header']['area']['content'] = 'Dummy header for texting block presentation.';
$handler->display->display_options['header']['area']['format'] = 'rich';
/* Field: Indexed Node: Title */
$handler->display->display_options['fields']['title']['id'] = 'title';
$handler->display->display_options['fields']['title']['table'] = 'search_api_index_partial_word_index';
$handler->display->display_options['fields']['title']['field'] = 'title';
$handler->display->display_options['fields']['title']['link_to_entity'] = 0;
/* Field: Indexed Node: Latin first name */
$handler->display->display_options['fields']['field_person_latin_fname']['id'] = 'field_person_latin_fname';
$handler->display->display_options['fields']['field_person_latin_fname']['table'] = 'search_api_index_partial_word_index';
$handler->display->display_options['fields']['field_person_latin_fname']['field'] = 'field_person_latin_fname';
/* Contextual filter: Search: More like this */
$handler->display->display_options['arguments']['search_api_views_more_like_this']['id'] = 'search_api_views_more_like_this';
$handler->display->display_options['arguments']['search_api_views_more_like_this']['table'] = 'search_api_index_partial_word_index';
$handler->display->display_options['arguments']['search_api_views_more_like_this']['field'] = 'search_api_views_more_like_this';
$handler->display->display_options['arguments']['search_api_views_more_like_this']['default_action'] = 'default';
$handler->display->display_options['arguments']['search_api_views_more_like_this']['default_argument_type'] = 'node';
$handler->display->display_options['arguments']['search_api_views_more_like_this']['default_argument_skip_url'] = TRUE;
$handler->display->display_options['arguments']['search_api_views_more_like_this']['summary']['format'] = 'default_summary';
$handler->display->display_options['arguments']['search_api_views_more_like_this']['fields'] = array(
'title' => 'title',
'field_person_latin_fname' => 'field_person_latin_fname',
);

/* Display: Block */
$handler = $view->new_display('block', 'Block', 'block_1');