I believe this Subject field might have recently been added or changed, as I do not remember having this problem a while back.
While I think the option to change your Subject Line for a test email is needed, it would be great if the original Subject Line could autofill this field or an option could be added to use the campaign's Subject Line.
This would prevent having to copy and paste the Subject Line each time I need to send a test to myself or a client. Thank you.
