What happened?

Description

When having a country field added to the sources of the index page of an entry type you get the error Illegal offset type

Steps to reproduce

1. Create a country field
2. Add the field to an entry type
3. Add the country field to the index page of the entry

Expected behavior

Not throwing an error and show a preview of the field.

Actual behavior

Throwing the error Illegal offset type

A possible fix could be

craftcms/cms/src/fields/Country.php

    public function getPreviewHtml(mixed $value, ElementInterface $element): string
    {
        if (!$value || !$value instanceof CountryModel) {
            return '';
        }

        $list = Craft::$app->getAddresses()->getCountryRepository()->getList(Craft::$app->language);
        return $list[$value->getCountryCode()] ?? $value;
    }

Craft CMS version

5.3.4

PHP version

8.3

Operating system and version

No response

Database type and version

No response

Image driver and version

No response

Installed plugins and versions