PHP Fatal error: Smarty error: [in CRM/Checksum/Form/Checksum.tpl line 83]: syntax error: unrecognized tag 'cs'

Just noticed this error was occurring, removing this line makes the fatal error go away. https://lab.civicrm.org/extensions/checksum/-/blame/master/templates/CRM/Checksum/Form/Checksum.tpl#L83

Full error message: PHP Fatal error: Smarty error: [in CRM/Checksum/Form/Checksum.tpl line 83]: syntax error: unrecognized tag 'cs' (Smarty_Compiler.class.php, line 584) in /civicrm/civicrm/packages/Smarty/Smarty.class.php on line 1100'

Agileware Ref: CIVICRM-2151