This is about submitting a Google Form, and then it sends response email to abc@gmail.com, and then forwarding it to another email xyz@gmail.com, and setting Reply-to to Google Form’s respondent email(sender@gmail.com)
Ex: https://zapier.com/editor/182467301/published/182467302
As per the above Zap, the email is sent with Reply-to (Google Form sender's email), but the final email (xyz@gmail.com) doesn't contain the Reply-to email (field/value, sender@gmail.com)