Hidden items don't appear on emagged machines

[The Grim Sleeper]

I have been rooting around in vending.dm (code for all vending machines), and there was no indication in that Emagging it should reveal hidden items.
The code does indicate that it should cut off the ID restrictions, like those on the Medical Vendors in Medbay.

So, I'd say, not a bug.
Could be a very good feature request though.