Maps can be duplicated by placing output in off-hand from cartography table

When attempting to zoom out a map with the cartography table, pressing F (or the equivalent key) to place the output in the off-hand generates a new, zoomed out map without consuming the original map or paper.

Steps to reproduce:

1. Open the cartography table interface.
2. Place a map item and at least one piece of paper into the input slots.
3. While hovering over the output map, press F (or the equivalent "swap hands" key).
4. A zoomed-out map will appear in the off-hand, but no resources will have been consumed (i.e. original map and paper are still in the table and can be used as such).

Note: this may be applicable to any operation with the cartography table, such as copying the map or locking it, but I have yet to test this.

 This also applies to other operations within the cartography table (copying, locking) and is not exclusive to survival mode (thank you Mark Derickson for checking on this).