src/Twig/EasyAdminTwigExtension.php
public function transchoice($message, $count, array $arguments = [], $domain = null, $locale = null)
    {
        if (null === $this->translator) {
            return strtr($message, $arguments);
        }

        return $this->translator->trans($message, array_merge(['%count%' => $count], $arguments), $domain, $locale);
    }
public function transchoice($message, $count, array $arguments = [], $domain = null, $locale = null)
    {
        if (null === $this->translator) {
            return strtr($message, $arguments);
        }

        return $this->translator->trans($message, array_merge(['%count%' => $count], $arguments), $domain, $locale);
    }
Remove this filter when the Symfony's requirement is equal or greater than 4.2
and use the built-in trans filter instead with a %count% parameter.