Author/etc data in table of contents is silently dropped after some time?

### Problem

I think this might be something in the internals of infobase.

e.g https://openlibrary.org/books/OL49205391M/The_great_modern_American_stories used to have author data in the table of contents when it was first added via tocky. But it has since disappeared, despite no edits causing its disappearance! More investigation needed.

Maybe the new fields must be added to https://openlibrary.org/type/toc_item in order to be correctly persisted during some infobase internal process?

### Reproducing the bug

1. Go to ...
2. Do ...

* Expected behavior:
* Actual behavior:

### Context

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- Environment (prod, dev, local): prod

### Breakdown

#### Requirements Checklist
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