Enabling this module enables openapi_jsonapi, openapi, schemata, schemata_json_schema but not Core's jsonapi module. Visiting /openapi/jsonapi?_format=json will then provide fatal error
The website encountered an unexpected error. Try again later.<br><br><em class="placeholder">Error</em>: Class "Drupal\jsonapi\Routing\Routes" not found in <em class="placeholder">[constant expression]()</em> (line <em class="placeholder">59</em> of <em class="placeholder">modules/contrib/openapi_jsonapi/src/Plugin/openapi/OpenApiGenerator/JsonApiGenerator.php</em>). <pre class="backtrace">Drupal\openapi_jsonapi\Plugin\openapi\OpenApiGenerator\JsonApiGenerator::create() (Line: 21)