CNX-80 -> GNS-480 upgrade: no longer resets to 1200?

My club is upgrading our collection of CNX-80's to the new GNS-480
software. We've noticed that when hooked up to a slaved xponder, the
squawk code is no longer reset to 1200 when you power down the unit.
The way we noticed this is having a few people "reminded" by the tower
that they should be squawking 1200 on VFR departures :-)

The units used to power-up squawking 1200. Now they come up
remembering the last code entered on the previous flight. This
doesn't seem very useful. Is this a deliberate design decision by
Garmin? Something imposed by the FAA? Or is it just a configuration
setting that can be changed by the user?

By-the-way, the vertical guidance on non-precision LNAV/GNAV
approaches is pretty neat. Constant descent profile, instead of dive
and drive. Less workload, easier on the engine, just all around
better in every way.