Autocomplete callback throws the following error when using the autocomplete field:
Error: Call to undefined method Drupal\search_api\Item\Item::getAccessResult() in Drupal\search_api_autocomplete\Plugin\search_api_autocomplete\suggester\LiveResults->getAutocompleteSuggestions() (line 341 of modules/contrib/search_api_autocomplete/src/Plugin/search_api_autocomplete/suggester/LiveResults.php).
This is a problem when search_api versions older than 8.x-1.14 is used on Drupal 8 sites and the newer access result method isn't included yet in the code. This patch will provide as an interim backwards compatibility for the older code until the sites are upgraded to use the newer versions of both search api and autocomplete.
Closed: won't fix
1.6
General code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
perhaps check for property as this depends on search_api version.
As that version of Search API is almost four years old and there has even been a security release in the meantime, please just keep your modules up to date instead.