@Benj****
nailed, it,
-they cancelled their original extension based on employment,
-applied for an "unable to travel due to covid 19" extension
-got an "under consideration stamp"
-then went in and applied for a new yearly extension with a new employer from it..
No great mystery, but it seems the O/P was confused about what they were doing. They were NOT applying for a new Non-B visa (which you can't do from an amnesty stamp) they were applying for a new yearly extension (which evidently you CAN do from a covid stamp).