Hi @muhammadaleemkhan,
I hope you are doing well today!
I do not want / can edit the core files as you told me. Why the Forminator Plugin is not able to fix this old issue.
Adding a mu-plugin does not mean to change or edit the core files, we suggest you to follow the mu-plugin approach to fix the issue. Our Forminator team is working on all reported issues, so it can take time to implement some features and fix bugs.
Please check below thread to have further information about mu-plugins
Must Use Plugins
You can also find more information below on how to use mu-plugins.
https://wpmudev.com/docs/using-wordpress/installing-wordpress-plugins/#installing-mu-plugins
And if something goes wrong, the website will not longer be running.
We suggest to test the code snippets on your dev/staging environment if you have one. mu-plugins could be kept on different php files, so if something goes wrong you can just remove that file, which makes it modular and easy to troubleshoot.
Kind regards,
Zafer