Trouble duplicating Distribution Level DFF in Buyer Work Center

In Buyer work center, when I duplicate a PO, the line level DFF copies as expected.

If I decide to duplicate a line, instead of the whole PO, the DFF from line one does not copy to line two.

Any ideas as to what might be missing?

In Buyer Work Center create a PO.

Add one line, and fill in the DFF on the distribution line. (Dff is displayed and is not context sensitive)

Save.

Duplicate line.

New line is created, but DFF is not copied.