Pending tasks cannot be executed

After updating to search_api-8.x-1.0-beta-4 I have pending tasks that cannot be executed. On the status report page, a warning is displayed, but not the "Execute now" link. I cannot call the search_api.execute_tasks route because the _search_api_tasks requirement fails. Drupal\search_api\Task\TaskManager::getTasksCount() is called without conditions from the requirements check and with these conditions from the access check:

Array
(
    [type] => Array
        (
            [0] => addIndex
            [1] => updateIndex
            [2] => removeIndex
            [3] => deleteItems
            [4] => deleteAllIndexItems
        )

)

The value in the search_api_task.type column is "search_api.entity_datasource.trackItemsInserted".