Nerys, thank you for letting us know.
Codes have been migrated to a separate field, but it's not yet searchable, as far as I can tell. I have a few artifacts left in my stories as well, but in the Latest Stories pages, the codes are in their separate field. We just need to create the search field now. I'm pretty sure the missing "Herm" in Hermione is because we have a code, "herm" for hermaphrodite. If the codes were moved via a global search, that would do it.
I'm pretty sure it's safe to fix the Hermione issue, and remove any lingering partial tags from the summary field. When you edit the story details, check the new field for the story codes, and make sure you have the right tags. I suspect "bigotry" might have been moved as "bi".