After updating the Editable Email Extension plugin in Jenkins, we encountered an issue where the plugin can no longer read content from an external file and include it in the email body.

Previously, we were able to read a value from the file /home/jenkins/logs/cleanup_message.txt and append it to the email content. However, after the update, the file content is not being read, and instead, we receive the following error in the email body:

ERROR: File '/home/jenkins/logs/cleanup_message.txt' does not exist

The file exists in the specified location, and Jenkins has the necessary permissions to access it. This issue started occurring immediately after the plugin update.

Plugin version: 1876.v28d8d38315b_d
Jenkins version: 2.492.1

Could you please investigate this issue? Let me know if you need any additional details.
Thanks.