Some levels drop scraps that aren't listed. Also, these scraps do not appear when you are searching for a scrap through the hero gear info screen.
Stages that I know drop scraps not listed:
24-4 drops lost concept art scraps.
24-6 drops PHAT pants scraps.
24-7 drops heal-Aid scraps.
It will be helpful if these were added to the stage info screen and when searching in hero gear. Some of these scrubs are definitely needed for C3 crafting and might as well pick up cyan scraps while farming.
If there are other scraps that drop on different levels that are listed feel free to add them to this thread. These are just the ones that I have noticed. Apologies if this was a duplicate thread I searched and couldn't find anything. I also submitted a bug reporting ticket.