Mark Hansen wrote:



So I wonder if the confusion came when ATC told Allen to Squawk VFR?
This just means that you're no longer in radar contact, and not that
you're no longer IFR, right?

No, that measn the controller thought you were VFR.




Or, are you supposed to maintain your transponder code until changed
by ATC or you cancel IFR - even if radar service is terminated?

If you are terminated you still stay on your code unless you are now
going to be VFR.