@MisterBill - we checked it out yesterday. It looks like only the Calendar screen was designed to handle the "Include First Line" mapping preference. The Work Order List was never designed to handle it (this was a miss on our side).
So my assumption is that previously you were using the calendar screen to do mapping, and then you recenty started doing mapping out of the Work Order List, and that's where you noticed the problem? I hope this is the case, otherwise, I need to search for a new theory!
Last night we pushed out an update to the standard Work Order List screen, so assuming you are still using the standard Work Order List screen, this issue should be resolved for you.
Can you please confirm?
Thank you for bringing this to our attention,