When trying to update existing 4.1 installations, an error occurs, breaking update:

-->quiz_statistics
Default exception handler: Eccezione - Call to undefined method quiz_statistics\task\recalculate::set_minute() Debug:
Error code: generalexceptionmessage

• line 398 of /lib/classes/task/manager.php: Error thrown
• line 95 of /lib/classes/task/manager.php: call to core\task\manager::scheduled_task_from_record()
• line 115 of /lib/classes/task/manager.php: call to core\task\manager::load_default_scheduled_tasks_for_component()
• line 645 of /lib/upgradelib.php: call to core\task\manager::reset_scheduled_tasks_for_component()
• line 797 of /lib/upgradelib.php: call to upgrade_component_updated()
• line 1953 of /lib/upgradelib.php: call to upgrade_plugins()
• line 202 of /admin/cli/upgrade.php: call to upgrade_noncore()

Tested on several test sites, error Always reproduced.