Email copy shows send date

Hi!
When we "copy" an email it used to have a blank "last send" field....now when we copy an email it is showing the "last send" as the date and time that we clicked the copy this email button. How can we clear this? Email id 384 has not been sent yet it is a copy of email ID 381 which has been sent.

Thank you for bringing this to our attention! This has been addressed.