I have faced the issue while trying to override the Credit Memo Email template from the admin. The email template doesn’t include the item list in the email. So, I have made a small plugin for that.

Step 1: You have to add this line in the Magemonkeys/SalesEmails/etc/di.xml

<?xml version="1.0" ?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
	<type name="MagentoEmailModelTemplate">
		<plugin disabled="false" name="Magemonkeys_SalesEmailTemplate_Plugin_Sales_Email_Model_Template" sortOrder="10" type="MagemonkeysSalesEmailTemplatePluginSalesEmails"/>
	</type>
</config>

Step 2: Add the SalesEmails.php file on this ‘Magemonkeys/SalesEmailTemplate/Plugin’ location and add the below code in it.

<?php
declare(strict_types=1);

namespace MagemonkeysSalesEmailTemplatePlugin;

class SalesEmails 
{

    public function beforeBeforeSave(MagentoEmailModelTemplate $subject)
    {
    	$subject->setData('is_legacy', 1);
        return [];
    }
}

That’s it.

After executing above tech codes,  run the required command to see the effect.

Note : Please delete the old custom template entry and made the new one.