Authors not redirecting after merge

Merging an author should redirect the IDs on all associated works and editions. Sometimes this does not happen. This prevents merging the affected works without editing the authors individually.

### Evidence / Screenshot (if possible)

### Relevant url?

https://openlibrary.org/authors/OL10347315A?m=history
https://openlibrary.org/works/OL29537362W/Mil_y_un_Fantasmas (Still present on this author when viewing the record, merge is not in the item's history. If you click to edit, the author is listed as "unknown author."
### Steps to Reproduce

1. Go to ... There are no steps to reproduce as it does not happen consistently. Or, at least, I have not identified the cause in order to identify when it will happen.
2. Do ...

* Actual:
* Expected:

### Details

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- **Environment (prod/dev/local)?** prod

### Proposal & Constraints

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