When I click in the first group of Wikilove popup I get
"JQMIGRATE: jQuery.fn.attr('checked') may use property instead of attribute"
from this line:
https://github.com/wikimedia/mediawiki-extensions-WikiLove/blob/master/resources/ext.wikiLove.core.js#L421
$( '#mw-wikilove-notify-checkbox' ).attr('checked', false);