When a design is duplicated, if there are items in the Packing > Other tab, they don't carry forward into the duplicated design.
A ticket has been created for this and we expect to see a mini-release as soon as possible.
I duplicated a design, B101085. Went into the new design, B101086, I found the "Other" items/materials empty. I then went back to the design I copied from, B101085, and found the "Other" had duplicated all the materials. As a check I printed the cut sheet, B101085, and found it to be correct.