In my experience, another way of seeing your not-yet-approved-or-revealed work is to click on the "Edit Works" button. (Not the "My works" list, of course, which as you point out doesn't show these not-yet-revealed submissions. But once you have got to the "My Works" page, then on the top right there should be an "Edit Works" button, and then the hidden fic should be in there.)

I hadn't noticed it was also in My Assignments. Good to know.

I too have had a few minutes of panic in the past...