It is possible the number of cards in a stack from which you delete audio before exiting with done may be a factor in whether the bug occurs when clicking on the first note of the next stack, and takes you instead to the first note of all notes. Typically I was editing about 10 cards in a stack before going to the next stack and odds seemed more likely to at least let me continue without the bug for one repeat of STEP A in that case. But in cases where I begin by editing 15-20 notes within the stack, the bug seems to appear immediately when I click on first note of the next stack.
Hmm, there is a certainly a bug there, but not quite sure what is triggering it. It doesn't seem to have anything to do with audio removal — I saw it just by moving between the notes, going to the next stack, etc etc. But it is intermittent. Sometimes it works fine, and other times, it indeed goes back to the first stack. Perhaps something is triggering a reload of the view, and throwing it off somehow.
Will note this issue down. If you do find something that you think is definitely triggering it, let me know.